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What rhythm type is it?","back":"Ultradian.","mcqOptions":[{"text":"Ultradian.","correct":true,"explanation":"Ultradian rhythms occur more than once within 24 hours. The approximately 90-minute cycle through different sleep stages is therefore an ultradian rhythm."},{"text":"Circadian.","correct":false,"explanation":"Circadian rhythms complete roughly one cycle every 24 hours, rather than every 90 minutes. A repeating 90-minute sleep cycle is an ultradian rhythm."},{"text":"Infradian.","correct":false,"explanation":"Infradian rhythms have cycles lasting longer than 24 hours, such as the menstrual cycle. A cycle repeating every 90 minutes is ultradian."},{"text":"Diurnal.","correct":false,"explanation":"Diurnal describes activity occurring during daylight and is not the classification for a 90-minute cycle. Rhythms repeating within 24 hours are ultradian."}]},{"id":"ecd27d1b-fb09-4a96-8025-eb3621c6ef70","cardType":"cloze","points":null,"front":"A [ ] rhythm lasts about 24 hours; an [ ] rhythm lasts more than 24 hours.","back":"A circadian rhythm lasts about 24 hours; an infradian rhythm lasts more than 24 hours.","mcqOptions":[{"text":"A circadian rhythm lasts about 24 hours; an infradian rhythm lasts more than 24 hours.","correct":true,"explanation":"Circadian rhythms have an approximately 24-hour cycle, while infradian rhythms take longer than 24 hours to complete one cycle."},{"text":"A infradian rhythm lasts about 24 hours; an circadian rhythm lasts more than 24 hours.","correct":false,"explanation":"The two classifications have been reversed. Circadian rhythms last about 24 hours, whereas infradian rhythms have cycles lasting longer than 24 hours."},{"text":"A ultradian rhythm lasts about 24 hours; an infradian rhythm lasts more than 24 hours.","correct":false,"explanation":"Ultradian rhythms repeat more than once within 24 hours, so they do not last about a day. The correct first term is circadian."},{"text":"A circadian rhythm lasts about 24 hours; an ultradian rhythm lasts more than 24 hours.","correct":false,"explanation":"Ultradian rhythms last less than 24 hours and repeat several times per day. Rhythms lasting more than 24 hours are classified as infradian."}]},{"id":"1a3ab2fb-cc48-46a7-abf9-3da9e7a5da64","cardType":"cloze","points":null,"front":"An internal biological clock is an [ ]; an external synchronising cue is an [ ].","back":"An internal biological clock is an endogenous pacemaker; an external synchronising cue is an exogenous zeitgeber.","mcqOptions":[{"text":"An internal biological clock is an endogenous pacemaker; an external synchronising cue is an exogenous zeitgeber.","correct":true,"explanation":"Endogenous pacemakers are internal mechanisms that regulate biological rhythms, while exogenous zeitgebers are environmental cues, such as light, that synchronise them."},{"text":"An internal biological clock is an exogenous zeitgeber; an external synchronising cue is an endogenous pacemaker.","correct":false,"explanation":"The terms have been reversed. An internal clock is an endogenous pacemaker, while an external environmental cue is an exogenous zeitgeber."},{"text":"An internal biological clock is an exogenous pacemaker; an external synchronising cue is an endogenous zeitgeber.","correct":false,"explanation":"Endogenous means originating within the body, while exogenous means originating outside it. The correct terms are endogenous pacemaker and exogenous zeitgeber."},{"text":"An internal biological clock is an endogenous zeitgeber; an external synchronising cue is an exogenous pacemaker.","correct":false,"explanation":"Pacemaker refers to the internal clock, whereas zeitgeber refers to a synchronising environmental cue. Therefore, the correct pairing is endogenous pacemaker and exogenous zeitgeber."}]},{"id":"f1352dba-d602-4818-9873-81a78cf922f4","cardType":"cloze","points":null,"front":"The main endogenous pacemaker is the [ ] in the [ ].","back":"The main endogenous pacemaker is the suprachiasmatic nucleus (SCN) in the hypothalamus.","mcqOptions":[{"text":"The main endogenous pacemaker is the suprachiasmatic nucleus (SCN) in the hypothalamus.","correct":true,"explanation":"The SCN is a small group of cells in the hypothalamus that acts as the body’s principal biological clock and regulates circadian rhythms."},{"text":"The main endogenous pacemaker is the pineal gland in the hypothalamus.","correct":false,"explanation":"The pineal gland releases melatonin but is not the main endogenous pacemaker. The main pacemaker is the suprachiasmatic nucleus, located in the hypothalamus."},{"text":"The main endogenous pacemaker is the suprachiasmatic nucleus (SCN) in the pineal gland.","correct":false,"explanation":"The SCN influences the pineal gland but is not located within it. It is a group of cells situated in the hypothalamus."},{"text":"The main endogenous pacemaker is the suprachiasmatic nucleus (SCN) in the thalamus.","correct":false,"explanation":"Confusing the thalamus with the similarly named hypothalamus mislocates the SCN. The suprachiasmatic nucleus is situated in the hypothalamus."}]},{"id":"477065d5-3530-4f36-9773-56684d2536ff","cardType":"basic","points":2,"front":"After light enters the eye, what pathway influences sleepiness?","back":"Eye → SCN → pineal gland → melatonin.","mcqOptions":[{"text":"Eye → SCN → pineal gland → melatonin.","correct":true,"explanation":"Light detected by the eye sends information to the SCN, which regulates the pineal gland’s secretion of melatonin and thereby influences sleepiness."},{"text":"Eye → pineal gland → SCN → melatonin.","correct":false,"explanation":"This reverses the SCN and pineal gland. Light information reaches the SCN first, which then controls melatonin release from the pineal gland."},{"text":"Eye → SCN → melatonin → pineal gland.","correct":false,"explanation":"Melatonin is the hormone released by the pineal gland, so it cannot precede the gland in the pathway. The pineal gland comes before melatonin."},{"text":"Eye → pituitary gland → SCN → melatonin.","correct":false,"explanation":"The pituitary gland is not the gland responsible for melatonin release. The SCN regulates the pineal gland, which then secretes melatonin."}]},{"id":"5bc845f8-24dd-4e5c-955b-b479c167627b","cardType":"cloze","points":null,"front":"The pineal gland releases [ ], usually more in [ ].","back":"The pineal gland releases melatonin, usually more in darkness.","mcqOptions":[{"text":"The pineal gland releases melatonin, usually more in darkness.","correct":true,"explanation":"The pineal gland increases melatonin secretion in darkness. Higher melatonin levels promote sleepiness and help regulate the sleep-wake cycle."},{"text":"The pineal gland releases melatonin, usually more in daylight.","correct":false,"explanation":"Light detected by the eyes inhibits melatonin production rather than increasing it. The pineal gland usually releases more melatonin in darkness."},{"text":"The pineal gland releases serotonin, usually more in darkness.","correct":false,"explanation":"Serotonin may be confused with melatonin because both affect mood or sleep, but the pineal gland’s key sleep-related hormone is melatonin, released more in darkness."},{"text":"The pineal gland releases cortisol, usually more in daylight.","correct":false,"explanation":"Cortisol is mainly released by the adrenal cortex and is associated with alertness and stress. The pineal gland releases melatonin, especially in darkness."}]},{"id":"3b9feaeb-985b-45d3-973d-3fe18e2688cd","cardType":"cloze","points":null,"front":"Entrainment means [ ] a biological rhythm to [ ].","back":"Entrainment means resetting or synchronising a biological rhythm to environmental cues.","mcqOptions":[{"text":"Entrainment means resetting or synchronising a biological rhythm to environmental cues.","correct":true,"explanation":"Entrainment is the process by which external cues, especially light, reset or synchronise an internal biological rhythm with the surrounding environment."},{"text":"Entrainment means initiating or generating a biological rhythm to internal clocks.","correct":false,"explanation":"This describes the internal production of rhythms rather than entrainment. Entrainment resets or synchronises an existing biological rhythm to environmental cues."},{"text":"Entrainment means resetting or synchronising a biological rhythm to internal cues.","correct":false,"explanation":"Entrainment specifically concerns synchronisation with external environmental cues, known as exogenous zeitgebers, rather than with internal cues or endogenous pacemakers."},{"text":"Entrainment means disrupting or desynchronising a biological rhythm to environmental cues.","correct":false,"explanation":"This reverses the meaning of entrainment. Environmental cues reset or synchronise biological rhythms; disrupting synchronisation is more characteristic of jet lag or shift work."}]},{"id":"d79d1134-2ff3-4a2e-8a0b-a3069adbf30d","cardType":"cloze","points":null,"front":"A phase advance shifts the body clock [ ]; a phase delay shifts it [ ].","back":"A phase advance shifts the body clock earlier; a phase delay shifts it later.","mcqOptions":[{"text":"A phase advance shifts the body clock earlier; a phase delay shifts it later.","correct":true,"explanation":"A phase advance moves the timing of a biological rhythm earlier, while a phase delay moves its timing later."},{"text":"A phase advance shifts the body clock later; a phase delay shifts it earlier.","correct":false,"explanation":"The directions have been reversed. An advance moves the body clock earlier, whereas a delay moves the body clock later."},{"text":"A phase advance shifts the body clock faster; a phase delay shifts it slower.","correct":false,"explanation":"Phase shifts change when the body clock is timed, not the speed at which it runs. An advance means earlier and a delay means later."},{"text":"A phase advance shifts the body clock earlier; a phase delay shifts it earlier.","correct":false,"explanation":"Only an advance shifts the rhythm earlier. A delay moves the timing in the opposite direction, so it shifts the body clock later."}]},{"id":"10986543-8553-4e80-9721-c95d8b473ec5","cardType":"basic","points":2,"front":"Why are phase delays usually easier than phase advances?","back":"The natural circadian cycle runs slightly longer than 24 hours.","mcqOptions":[{"text":"The natural circadian cycle runs slightly longer than 24 hours.","correct":true,"explanation":"The endogenous circadian rhythm averages slightly over 24 hours, so delaying sleep fits its natural tendency better than advancing sleep to an earlier time."},{"text":"The natural circadian cycle runs slightly shorter than 24 hours.","correct":false,"explanation":"This reverses the established relationship. The natural circadian rhythm runs slightly longer than 24 hours, making a phase delay easier than a phase advance."},{"text":"The natural circadian cycle runs exactly in line with 24 hours.","correct":false,"explanation":"Assuming an exact 24-hour rhythm cannot explain why delays are easier. The endogenous cycle is slightly longer than 24 hours, creating a natural tendency to shift later."},{"text":"The natural circadian cycle runs independently of its endogenous pacemaker.","correct":false,"explanation":"The circadian cycle is generated by an endogenous pacemaker rather than operating independently of it. Its slightly longer-than-24-hour duration makes phase delays easier."}]},{"id":"05324973-6ca4-40e6-888d-98fc5309a29a","cardType":"cloze","points":null,"front":"Circadian disruption happens when the internal body clock is [ ] with [ ].","back":"Circadian disruption happens when the internal body clock is out of sync with external demands.","mcqOptions":[{"text":"Circadian disruption happens when the internal body clock is out of sync with external demands.","correct":true,"explanation":"Circadian disruption occurs when endogenous rhythms do not match environmental or social requirements, such as local time after travel or working during the night."},{"text":"Circadian disruption happens when the internal body clock is in sync with external demands.","correct":false,"explanation":"Being aligned with external demands is successful entrainment, not disruption. Circadian disruption occurs when the internal body clock is out of sync with those demands."},{"text":"Circadian disruption happens when the internal body clock is out of sync with its endogenous pacemaker.","correct":false,"explanation":"The body clock is controlled by an endogenous pacemaker, so these are not opposing systems. Disruption arises when the internal clock conflicts with external demands."},{"text":"Circadian disruption happens when the internal body clock is fully synchronised with environmental time cues.","correct":false,"explanation":"Full synchronisation with environmental cues describes entrainment and should support normal functioning. Disruption instead means the internal clock is out of sync with external demands."}]},{"id":"22d38890-be28-485c-8108-ed7cac692a10","cardType":"basic","points":2,"front":"Why does behaviour suffer during circadian disruption?","back":"The person performs when their body is not biologically prepared.","mcqOptions":[{"text":"The person performs when their body is not biologically prepared.","correct":true,"explanation":"Circadian rhythms regulate alertness, hormones and body temperature. Performance declines when external demands require activity at a biological time suited to sleep or reduced alertness."},{"text":"The person performs when their body is fully biologically prepared.","correct":false,"explanation":"Biological preparedness would support effective performance rather than impair it. Behaviour suffers because circadian disruption forces performance when the body is not biologically prepared."},{"text":"The person performs when their body is not consciously motivated.","correct":false,"explanation":"Circadian disruption concerns biological timing rather than a lack of conscious motivation. Performance declines because the person must act when their body is not biologically prepared."},{"text":"The person performs when their body is unable to detect external cues.","correct":false,"explanation":"The main problem is not an inability to detect environmental cues. Behaviour suffers because required performance occurs when internal biological rhythms have not prepared the body."}]},{"id":"c379cae4-a80c-455d-9f38-b630f9e69efc","cardType":"basic","points":2,"front":"Why is eastward travel often harder than westward travel?","back":"Eastward travel requires a phase advance.","mcqOptions":[{"text":"Eastward travel requires a phase advance.","correct":true,"explanation":"Travelling east makes local time later, requiring sleep and waking to move earlier relative to the traveller’s body clock. This phase advance opposes the clock’s tendency to delay."},{"text":"Eastward travel requires a phase delay.","correct":false,"explanation":"A phase delay is normally required after westward travel, when local time is earlier. Eastward travel requires a phase advance, which is harder for the circadian clock."},{"text":"Eastward travel requires a longer free-running rhythm.","correct":false,"explanation":"Travel does not require the endogenous rhythm itself to become longer. Eastward travel requires the existing body clock to phase advance to an earlier schedule."},{"text":"Eastward travel requires a reduction in external zeitgebers.","correct":false,"explanation":"Reducing zeitgebers would not produce the necessary adjustment and could slow entrainment. Eastward travel is harder because it requires a phase advance of the body clock."}]},{"id":"812b96d8-7d1d-431c-a17b-341824a26845","cardType":"basic","points":2,"front":"Why may night workers struggle to stay alert?","back":"Their body is biologically prepared for sleep.","mcqOptions":[{"text":"Their body is biologically prepared for sleep.","correct":true,"explanation":"At night, circadian changes such as increased melatonin and reduced core body temperature promote sleep. Night workers must therefore remain alert when their biology favours sleep."},{"text":"Their body is biologically prepared for wakefulness.","correct":false,"explanation":"Biological preparation for wakefulness would make alertness easier, not harder. Night workers struggle because their circadian rhythms prepare the body for sleep during the night."},{"text":"Their body is biologically prepared for physical activity.","correct":false,"explanation":"The circadian system does not normally promote peak physical activity at night. Night workers struggle because their body is biologically prepared for sleep instead."},{"text":"Their body is biologically prepared for food consumption.","correct":false,"explanation":"Although circadian rhythms affect digestion, preparation for eating does not explain reduced alertness. The central conflict is that the body is biologically prepared for sleep."}]},{"id":"2ffd56c7-a28c-42e9-b741-0b40607465b8","cardType":"basic","points":2,"front":"Why may night workers struggle to sleep during the day?","back":"Light, noise and social responsibilities make sleep harder.","mcqOptions":[{"text":"Light, noise and social responsibilities make sleep harder.","correct":true,"explanation":"Daytime exposes night workers to light and noise, while social or family obligations may interrupt rest. These environmental demands make sustained, good-quality sleep more difficult."},{"text":"Darkness, quiet and reduced responsibilities make sleep harder.","correct":false,"explanation":"These conditions usually support rather than obstruct sleep. Daytime sleeping is difficult because light, noise and social responsibilities interfere with the worker’s opportunity to rest."},{"text":"Melatonin, darkness and lower body temperature make sleep harder.","correct":false,"explanation":"These factors generally promote sleep and form part of the body’s night-time preparation. Daytime light, noise and social responsibilities are the factors that make sleep harder."},{"text":"Quiet surroundings, comfort and social isolation make sleep harder.","correct":false,"explanation":"Quiet and comfort normally improve sleep, while reduced social contact limits interruptions. Night workers instead face daytime light, noise and social responsibilities that disrupt sleep."}]},{"id":"db70addf-bd43-48c4-b1da-f7d82e832604","cardType":"basic","points":2,"front":"What was Czeisler et al. (1982) aiming to improve?","back":"Rotating shift schedules using circadian principles.","mcqOptions":[{"text":"Rotating shift schedules using circadian principles.","correct":true,"explanation":"Czeisler and colleagues applied knowledge of circadian rhythms to redesign rotating shift schedules, aiming to improve workers’ adjustment, health, alertness and productivity."},{"text":"Permanent night-shift lighting using circadian principles.","correct":false,"explanation":"The intervention focused on the direction and timing of rotating shifts, not simply workplace lighting for permanent night workers. Its aim was to improve rotating shift schedules."},{"text":"Clinical sleep-disorder diagnoses using circadian principles.","correct":false,"explanation":"The researchers were not developing a diagnostic procedure for sleep disorders. They applied circadian principles to improve rotating shift schedules in a real workplace."},{"text":"Employee recruitment procedures using circadian principles.","correct":false,"explanation":"Recruitment was not the target of the research. Czeisler and colleagues aimed to improve rotating shift schedules by aligning rotation with natural circadian tendencies."}]},{"id":"198eafe9-6706-451b-9d8f-4652c941901d","cardType":"basic","points":1,"front":"What type of study was Czeisler et al. (1982)?","back":"A field intervention, often called a quasi-experiment.","mcqOptions":[{"text":"A field intervention, often called a quasi-experiment.","correct":true,"explanation":"The researchers deliberately changed shift schedules in a real workplace but lacked the full random allocation and control of a laboratory experiment, making it a quasi-experiment."},{"text":"A laboratory experiment, often called a controlled trial.","correct":false,"explanation":"The study took place in an actual workplace rather than a tightly controlled laboratory. It was a field intervention, usually classified as a quasi-experiment."},{"text":"A case study, often called a clinical investigation.","correct":false,"explanation":"A case study provides detailed investigation of an individual or small unit without this type of planned workplace manipulation. Czeisler’s research was a field intervention or quasi-experiment."},{"text":"A self-report survey, often called a questionnaire study.","correct":false,"explanation":"The researchers did not merely collect workers’ reported opinions or experiences. They intervened by changing shift schedules in the workplace, creating a field quasi-experiment."}]},{"id":"ee6b01cf-3827-4fde-bd2f-7ec7c90f4c35","cardType":"basic","points":2,"front":"Why is a night to evening to day rota disruptive?","back":"It creates repeated phase advances.","mcqOptions":[{"text":"It creates repeated phase advances.","correct":true,"explanation":"Moving from night to evening to day repeatedly shifts sleep and waking earlier. These phase advances oppose the body clock’s natural tendency and are relatively difficult to adjust to."},{"text":"It creates repeated phase delays.","correct":false,"explanation":"This reverses the direction of the shift. A night to evening to day rota creates repeated phase advances, requiring workers to sleep and wake progressively earlier."},{"text":"It prevents repeated phase changes.","correct":false,"explanation":"Rotating between night, evening and day shifts repeatedly changes the timing of sleep. It specifically produces phase advances, rather than preventing changes to the body clock."},{"text":"It creates permanent circadian entrainment.","correct":false,"explanation":"Workers do not become permanently entrained when their shift times keep changing. The rota is disruptive because it creates repeated phase advances in their sleep-wake cycle."}]},{"id":"3dea4a17-22e8-4140-8957-622818858489","cardType":"basic","points":1,"front":"Which rota direction is usually better for the body clock?","back":"Day → evening → night.","mcqOptions":[{"text":"Day → evening → night.","correct":true,"explanation":"Forward rotation moves shifts progressively later, producing phase delays. The human body clock adjusts more easily to delays because its natural cycle is slightly longer than 24 hours."},{"text":"Night → evening → day.","correct":false,"explanation":"Backward rotation requires repeated phase advances, meaning progressively earlier sleeping and waking. The body clock generally adjusts better to the forward day → evening → night direction."},{"text":"Evening → day → night.","correct":false,"explanation":"This rota does not consistently move shifts forward and therefore disrupts orderly adjustment. Day → evening → night is preferable because it produces manageable phase delays."},{"text":"Day → night → evening.","correct":false,"explanation":"Jumping directly from day to night creates a large, irregular change in sleep timing. Day → evening → night shifts the body clock later in a consistent direction."}]},{"id":"017b7b96-cbdb-49be-bf50-c0e053e109b6","cardType":"basic","points":2,"front":"Why is day to evening to night usually better?","back":"It produces phase delays, which are easier.","mcqOptions":[{"text":"It produces phase delays, which are easier.","correct":true,"explanation":"Forward rotation shifts sleep and waking progressively later, creating phase delays. These are easier because the human circadian rhythm naturally tends to run slightly beyond 24 hours."},{"text":"It produces phase advances, which are easier.","correct":false,"explanation":"Forward rotation produces phase delays, not phase advances. Advances require earlier sleeping and waking and are generally harder for the body clock to achieve."},{"text":"It produces phase delays, which are harder.","correct":false,"explanation":"The direction is identified correctly, but its difficulty is reversed. Phase delays are generally easier because the body clock naturally tends to shift later rather than earlier."},{"text":"It produces phase advances, which are harder.","correct":false,"explanation":"Although phase advances are usually harder, a day to evening to night rota does not produce them. It produces phase delays by moving working and sleeping times later."}]},{"id":"570ec6d4-19e9-4f08-b4ed-d516c18c726c","cardType":"basic","points":2,"front":"What did Czeisler et al. find after redesigning the rota?","back":"Workers showed better adjustment, with improved sleep and less tiredness.","mcqOptions":[{"text":"Workers showed better adjustment, with improved sleep and less tiredness.","correct":true,"explanation":"After the rota was changed to rotate forward and change less frequently, workers adjusted better. They reported improved sleep quality and duration, alongside reduced tiredness."},{"text":"Workers showed worse adjustment, with poorer sleep and more tiredness.","correct":false,"explanation":"This reverses the reported outcome. Czeisler et al. found better adjustment after the rota redesign, including improved sleep and reduced tiredness among the workers."},{"text":"Workers showed no adjustment, with unchanged sleep and tiredness.","correct":false,"explanation":"The redesign did produce measurable improvements rather than no change. Workers showed better adjustment, reporting improved sleep and less tiredness under the new rota."},{"text":"Workers showed better adjustment, with poorer sleep and more tiredness.","correct":false,"explanation":"Better adjustment would not be indicated by worsening sleep and fatigue. Czeisler et al. found improved sleep and less tiredness following the redesigned rota."}]},{"id":"7a11df1a-c0b5-496f-97f9-4bec1bd416a2","cardType":"basic","points":2,"front":"Why does Czeisler et al. have ecological validity?","back":"It studied real workers in a real workplace.","mcqOptions":[{"text":"It studied real workers in a real workplace.","correct":true,"explanation":"The research examined workers carrying out genuine jobs under normal workplace conditions. This makes the findings more applicable to real shift work and gives the study ecological validity."},{"text":"It studied student volunteers in a sleep laboratory.","correct":false,"explanation":"A student sample in an artificial laboratory would reduce ecological validity. Czeisler et al. studied real workers in their real workplace, making the setting representative of genuine shift work."},{"text":"It used random allocation in a controlled laboratory.","correct":false,"explanation":"Random allocation and laboratory control concern causal inference and experimental control, not ecological validity. The study’s ecological validity came from examining real workers in a real workplace."},{"text":"It collected artificial tasks in a simulated workplace.","correct":false,"explanation":"Artificial tasks and a simulated setting would make behaviour less representative of everyday employment. Czeisler et al. instead studied real workers in a real workplace."}]},{"id":"95e709cb-f42a-4b3e-bded-6431322d8a44","cardType":"basic","points":2,"front":"Why is cause and effect limited in Czeisler et al.?","back":"Other workplace changes may have affected sleep or satisfaction.","mcqOptions":[{"text":"Other workplace changes may have affected sleep or satisfaction.","correct":true,"explanation":"Because the rota redesign occurred in a real workplace, other changes were not fully controlled. These confounding variables could explain improvements in sleep or satisfaction, weakening causal conclusions."},{"text":"The rota direction remained unchanged throughout the study.","correct":false,"explanation":"The rota was deliberately redesigned, so its direction did not remain unchanged. Cause and effect are limited because other workplace changes may also have influenced sleep or satisfaction."},{"text":"The workers’ circadian rhythms could not affect their sleep.","correct":false,"explanation":"Circadian rhythms directly influence sleep, so this claim is biologically incorrect. Causal inference is limited because uncontrolled workplace changes, rather than only the rota, may explain the results."},{"text":"The workplace setting made all variables fully controlled.","correct":false,"explanation":"A real workplace usually provides less control than a laboratory, not complete control. Other workplace changes may have affected sleep or satisfaction and created alternative explanations."}]},{"id":"acc3531d-e450-407d-81cc-e8e8786c1f7a","cardType":"basic","points":2,"front":"Why may Czeisler et al. have limited generalisability?","back":"The sample was mainly male industrial workers from one setting.","mcqOptions":[{"text":"The sample was mainly male industrial workers from one setting.","correct":true,"explanation":"A predominantly male sample from one industrial workplace may not represent women, other occupations or different organisations. This restricts how widely the findings can be generalised."},{"text":"The sample included mainly female office workers from many settings.","correct":false,"explanation":"This does not describe Czeisler et al.’s sample. Participants were mainly male industrial workers from one setting, limiting generalisation to other genders, occupations and workplaces."},{"text":"The sample included randomly selected workers from across the country.","correct":false,"explanation":"A nationwide random sample would support broad generalisation, but the study did not use one. It mainly examined male industrial workers from a single workplace."},{"text":"The sample was highly representative of all workers across many settings.","correct":false,"explanation":"The sample was not representative of the entire working population. It consisted mainly of male industrial workers from one setting, so generalisability is restricted."}]},{"id":"4c591d4e-d503-468e-b515-0e6e49f36d47","cardType":"basic","points":2,"front":"How can self-report data weaken Czeisler et al.?","back":"Reports may be affected by social desirability or demand characteristics.","mcqOptions":[{"text":"Reports may be affected by social desirability or demand characteristics.","correct":true,"explanation":"Workers may report what seems acceptable or what they think researchers expect, rather than their genuine sleep and tiredness. These response biases reduce the validity of self-report data."},{"text":"Reports may eliminate response bias and demand characteristics.","correct":false,"explanation":"Self-reports do not eliminate response bias; they are especially vulnerable to it. Social desirability and demand characteristics may lead workers to give inaccurate accounts of sleep or tiredness."},{"text":"Reports may directly measure melatonin levels or core body temperature.","correct":false,"explanation":"Self-reports record participants’ subjective accounts and do not directly measure physiological variables. Their weakness is that social desirability or demand characteristics may distort responses."},{"text":"Reports may be affected by observer bias or low inter-observer reliability.","correct":false,"explanation":"These issues primarily concern observations scored by researchers, rather than participants reporting their own experiences. Self-reports are weakened by social desirability and demand characteristics."}]},{"id":"df3f2d8a-20f4-4501-ac32-94dd7c816bd7","cardType":"basic","points":2,"front":"For a phase advance, what timed light strategy helps?","back":"

Bright morning light shifts the clock earlier.
Reduced evening light avoids delaying it.

","mcqOptions":[{"text":"

Bright morning light shifts the clock earlier.
Reduced evening light avoids delaying it.

","correct":true,"explanation":"Morning light advances the circadian clock, while limiting evening light prevents a phase delay. Together, these timings shift sleep and waking towards an earlier time."},{"text":"

Bright evening light shifts the clock earlier.
Reduced morning light avoids delaying it.

","correct":false,"explanation":"This reverses the appropriate timings: evening light usually delays the circadian clock, while morning light advances it. A phase advance requires bright morning light and reduced evening light."},{"text":"

Reduced morning light shifts the clock earlier.
Bright evening light avoids delaying it.

","correct":false,"explanation":"Avoiding morning light removes an important advancing cue, and bright evening light promotes a delay. Bright morning light combined with reduced evening light produces a phase advance."},{"text":"

Bright afternoon light shifts the clock earlier.
Reduced midday light avoids delaying it.

","correct":false,"explanation":"Light around midday or afternoon does not provide the required combination of strong advancing and delay-prevention cues. Bright morning light and reduced evening light are used to shift the clock earlier."}]}]}],"examCountdown":{"examDate":"2027-05-10","paperLabel":"Paper 1"},"heading":"Biological rhythms (Biological)","title":"Biological rhythms (Biological) Flashcards","topbar":{"backHref":"/as-level/psychology/ocr/flashcards"},"topicSidebar":"$L36"}]}],"topicId":"434018be-b981-577a-b916-89389c5b4b2f","walled":"$L37"}],"$L38","$L39"]