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REM stands for rapid eye movement because the eyes move quickly beneath the eyelids."},{"text":"Resting eye motion.","correct":false,"explanation":"The eyes are not simply resting during this stage. REM stands for rapid eye movement, referring to their characteristic quick movements beneath closed eyelids."},{"text":"Repeated eye movement.","correct":false,"explanation":"Although the eye movements may recur, repeated is not the term represented by R. REM stands for rapid eye movement, describing their speed."}]},{"id":"01bd916f-bc4e-4069-820b-2d4a9cb21397","cardType":"basic","points":1,"front":"What happens to the body's muscles during REM sleep?","back":"The muscles become limp and effectively paralysed.","mcqOptions":[{"text":"The muscles become limp and effectively paralysed.","correct":true,"explanation":"During REM sleep, signals suppress most skeletal muscle movement, producing muscle atonia. This paralysis helps prevent the sleeper from physically acting out dreams."},{"text":"The muscles become tense and highly responsive.","correct":false,"explanation":"REM is sometimes mistaken for a state of whole-body activity because the brain is active. Most skeletal muscles actually become limp and effectively paralysed."},{"text":"The muscles begin moving to act out dreams.","correct":false,"explanation":"Normal REM atonia prevents most dream enactment rather than causing it. The muscles become limp and effectively paralysed while dreaming commonly occurs."},{"text":"The muscles remain unchanged from waking levels.","correct":false,"explanation":"Muscle tone does not usually remain at its waking level during REM sleep. It falls sharply, leaving most skeletal muscles limp and effectively paralysed."}]},{"id":"2498b773-a2ea-4e22-aee5-30309fb96358","cardType":"basic","points":1,"front":"How active is the brain during REM sleep?","back":"It becomes nearly as active as when awake.","mcqOptions":[{"text":"It becomes nearly as active as when awake.","correct":true,"explanation":"REM sleep is sometimes called paradoxical sleep because brain activity rises to nearly waking levels even though the person remains asleep and largely paralysed."},{"text":"It becomes almost completely inactive throughout REM.","correct":false,"explanation":"Sleep does not mean that the brain switches off. During REM sleep, the brain becomes nearly as active as when awake."},{"text":"It remains much less active than in deep sleep.","correct":false,"explanation":"This reverses the pattern of activity across sleep stages. The brain is highly active during REM, becoming nearly as active as when awake."},{"text":"It becomes more active than at any waking time.","correct":false,"explanation":"REM involves high activity, but describing it as exceeding every waking state overstates the comparison. It becomes nearly as active as when awake."}]},{"id":"1ede5374-9e60-41d6-9ea8-08573f9ba91a","cardType":"basic","points":1,"front":"When do REM periods become longer during the night?","back":"They become longer towards morning.","mcqOptions":[{"text":"They become longer towards morning.","correct":true,"explanation":"REM periods generally lengthen across successive sleep cycles, so later episodes are longer and more REM sleep occurs as morning approaches."},{"text":"They become longer just after falling asleep.","correct":false,"explanation":"Early-night REM periods are relatively short, not the longest. They lengthen over successive cycles and become longer towards morning."},{"text":"They become longer during the middle of the night.","correct":false,"explanation":"Focusing on the middle of the night misses the progressive pattern across sleep cycles. REM periods become longest towards morning."},{"text":"They become longer before the first sleep cycle.","correct":false,"explanation":"REM periods occur within sleep cycles, so there is no REM period before the first cycle. They become longer towards morning."}]},{"id":"32f1b1ee-35ac-4cb6-83cc-dd62c7833e5b","cardType":"basic","points":1,"front":"What is the activation stage of activation-synthesis theory?","back":"The random firing of neurons during REM sleep.","mcqOptions":[{"text":"The random firing of neurons during REM sleep.","correct":true,"explanation":"Activation is the spontaneous, random neural firing generated during REM sleep. This provides the raw internal signals that the cortex later organises."},{"text":"The deliberate recall of memories during REM sleep.","correct":false,"explanation":"Activation is not a deliberate memory search by the sleeper. It is the random firing of neurons during REM sleep, which produces unstructured signals."},{"text":"The logical ordering of events during REM sleep.","correct":false,"explanation":"Logical ordering belongs to synthesis, when the cortex constructs a storyline. Activation is the earlier random firing of neurons during REM sleep."},{"text":"The complete silencing of neurons during REM sleep.","correct":false,"explanation":"Activation cannot involve neural silence because REM is a highly active brain state. It refers to the random firing of neurons during REM sleep."}]},{"id":"f0abdce7-ed81-4c71-92e7-4e68b4f914c3","cardType":"basic","points":1,"front":"What is the synthesis stage of activation-synthesis theory?","back":"The cortex makes the neural activity into a coherent storyline.","mcqOptions":[{"text":"The cortex makes the neural activity into a coherent storyline.","correct":true,"explanation":"During synthesis, the cortex interprets and organises random REM signals, combining them with stored information to create the relatively coherent narrative experienced as a dream."},{"text":"The brainstem stops the neural activity before a storyline forms.","correct":false,"explanation":"The brainstem helps initiate activation rather than stopping it. In synthesis, the cortex makes the neural activity into a coherent storyline."},{"text":"The thalamus converts the neural activity into external sensations.","correct":false,"explanation":"The thalamus relays internally generated signals, but these are not external sensations. Synthesis occurs when the cortex makes the activity into a coherent storyline."},{"text":"The cortex separates the neural activity from stored memories.","correct":false,"explanation":"The cortex draws on stored memories rather than separating them from REM signals. It synthesises the neural activity into a coherent storyline."}]},{"id":"87b4917c-6621-4e2d-9602-8ff1dd17e343","cardType":"basic","points":2,"front":"Where does REM activation begin, and how does it spread?","back":"It begins in the brainstem and spreads upwards through the thalamus and limbic system.","mcqOptions":[{"text":"It begins in the brainstem and spreads upwards through the thalamus and limbic system.","correct":true,"explanation":"Activation-synthesis theory proposes that REM activation originates in the brainstem, then travels upwards through areas including the thalamus and limbic system."},{"text":"It begins in the cortex and spreads downwards through the cerebellum and spinal cord.","correct":false,"explanation":"This reverses the proposed direction and substitutes unrelated structures. REM activation begins in the brainstem and spreads upwards through the thalamus and limbic system."},{"text":"It begins in the hippocampus and spreads upwards through the cortex and motor system.","correct":false,"explanation":"The hippocampus contributes memories but is not identified as the starting point. Activation begins in the brainstem and spreads through the thalamus and limbic system."},{"text":"It begins in the thalamus and spreads downwards through the brainstem and limbic system.","correct":false,"explanation":"This incorrectly makes the thalamus the source and sends activation downwards. It begins in the brainstem and spreads upwards through the thalamus and limbic system."}]},{"id":"6e1ac498-d452-4a57-b59d-9d83f9b07bb1","cardType":"basic","points":2,"front":"Why does activation-synthesis theory link dreaming to REM sleep?","back":"Dreaming is linked to REM because random neural activity occurs during REM.","mcqOptions":[{"text":"Dreaming is linked to REM because random neural activity occurs during REM.","correct":true,"explanation":"Activation-synthesis theory links dreaming with REM because this stage generates random neural signals that the cortex interprets and organises into dream content."},{"text":"Dreaming is linked to REM because all neural activity stops during REM.","correct":false,"explanation":"REM is associated with substantial brain activity, not neural shutdown. Dreaming is linked to REM because random neural activity occurs during this stage."},{"text":"Dreaming is linked to REM because external sensations increase during REM.","correct":false,"explanation":"Dream content is generated from internal activity rather than increased external sensory input. Random neural activity during REM provides signals for the cortex to interpret."},{"text":"Dreaming is linked to REM because memories are permanently stored during REM.","correct":false,"explanation":"Memory processes may be associated with sleep, but permanent storage is not the theory's explanation for dreaming. It emphasises random neural activity occurring during REM."}]},{"id":"9ca5564e-8c72-4c93-88f0-459a6894d514","cardType":"basic","points":1,"front":"What does the thalamus contribute to a dream?","back":"It relays internal signals that generate vivid imagery and sensations.","mcqOptions":[{"text":"It relays internal signals that generate vivid imagery and sensations.","correct":true,"explanation":"The thalamus relays internally generated neural signals towards the cortex, helping produce the vivid sensory images and sensations experienced within dreams."},{"text":"It relays external signals that generate accurate awareness of the bedroom.","correct":false,"explanation":"Dreaming is not based on an accurate stream of external sensory information. The thalamus relays internal signals that generate vivid imagery and sensations."},{"text":"It blocks internal signals to prevent imagery and sensations from forming.","correct":false,"explanation":"This reverses the thalamus's proposed contribution to dreaming. It relays internal signals that help generate vivid imagery and sensations rather than preventing them."},{"text":"It organises stored memories into a logical and coherent storyline.","correct":false,"explanation":"Constructing a coherent storyline is attributed mainly to cortical synthesis, not the thalamus. The thalamus relays internal signals that generate vivid imagery and sensations."}]},{"id":"37b762cc-ca45-4785-9304-1f2d2c41bd4e","cardType":"basic","points":2,"front":"Why can a dream feel real while it is happening?","back":"There is no external sensory information to check the dream against reality.","mcqOptions":[{"text":"There is no external sensory information to check the dream against reality.","correct":true,"explanation":"During dreaming, limited external sensory input means internally produced images are not effectively compared with the real environment, allowing them to feel convincing."},{"text":"There is constant external sensory information to confirm that the dream is real.","correct":false,"explanation":"This reverses the role of sensory input during sleep. A dream can feel real because there is no external sensory information available to check it against reality."},{"text":"There is no stored memory available to provide any familiar dream content.","correct":false,"explanation":"Stored memories do contribute familiar people, places and events to dreams. Realism instead results from lacking external sensory information to check the dream against reality."},{"text":"There is increased logical reasoning available to prove the dream is really happening.","correct":false,"explanation":"Dream realism is not produced by stronger logical proof. With little external sensory information, the brain cannot effectively check the dream against reality."}]},{"id":"791ea835-930c-420c-b197-89924f4c5b81","cardType":"basic","points":1,"front":"What does the limbic system contribute to a dream?","back":"It contributes emotion to the dream.","mcqOptions":[{"text":"It contributes emotion to the dream.","correct":true,"explanation":"The limbic system is strongly involved in emotional processing, so its activation helps account for the intense emotional content commonly experienced in dreams."},{"text":"It contributes muscle paralysis to the dream.","correct":false,"explanation":"Muscle paralysis is a bodily feature of REM linked to brainstem mechanisms, not dream content supplied by the limbic system. The limbic system contributes emotion."},{"text":"It contributes external vision to the dream.","correct":false,"explanation":"Dream images are internally generated rather than supplied by external vision. The limbic system's relevant contribution is emotion because it processes emotional responses."},{"text":"It contributes logical reasoning to the dream.","correct":false,"explanation":"The limbic system specialises in emotion rather than logical reasoning. Its activation helps explain why dreams often contain powerful emotional experiences."}]},{"id":"032c1792-b451-4624-ad78-4975fae1cd90","cardType":"basic","points":1,"front":"What does the hippocampus contribute to dream content?","back":"It contributes memories, such as familiar faces and places.","mcqOptions":[{"text":"It contributes memories, such as familiar faces and places.","correct":true,"explanation":"The hippocampus is important for memory, so its involvement helps dreams incorporate remembered material, including recognisable people, locations and previous experiences."},{"text":"It contributes sensations, such as pain and physical movement.","correct":false,"explanation":"Sensory experiences are not the hippocampus's main contribution in this account. It supplies memories, such as familiar faces and places, to dream content."},{"text":"It contributes emotions, such as fear and sudden alarm.","correct":false,"explanation":"Fear and alarm are more specifically associated with amygdala activation. The hippocampus contributes memories, including familiar faces and places, to dreams."},{"text":"It contributes reflexes, such as blinking and rapid breathing.","correct":false,"explanation":"Reflex control is not the hippocampus's role in dream construction. As a memory-related structure, it contributes memories such as familiar faces and places."}]},{"id":"2a5695e0-7b16-4ce0-aee9-e3a6e0dc71da","cardType":"basic","points":2,"front":"Why can activation of the amygdala create fear in a dream?","back":"The amygdala processes fear, producing alarm without a real threat.","mcqOptions":[{"text":"The amygdala processes fear, producing alarm without a real threat.","correct":true,"explanation":"The amygdala is involved in detecting and processing fear. Its activation during a dream can therefore generate alarm even when no external danger exists."},{"text":"The amygdala processes vision, producing alarm without a real threat.","correct":false,"explanation":"The amygdala may respond to threatening images, but visual processing is not its defining function here. It processes fear, creating alarm without a real threat."},{"text":"The amygdala retrieves memories, producing alarm without a real threat.","correct":false,"explanation":"Memory retrieval is more closely associated with the hippocampus in this account. The amygdala processes fear, which can produce alarm despite there being no real threat."},{"text":"The amygdala controls paralysis, producing alarm without a real threat.","correct":false,"explanation":"REM muscle paralysis is not controlled by the amygdala. The amygdala's role in processing fear explains alarm arising in a dream without genuine danger."}]},{"id":"8aa4a7f0-51c9-4b46-b6e2-1aa00b66f789","cardType":"basic","points":2,"front":"How does the cortex turn REM activity into the dream you remember?","back":"It uses stored memories to build a storyline from the incoming activity.","mcqOptions":[{"text":"It uses stored memories to build a storyline from the incoming activity.","correct":true,"explanation":"The cortex interprets random incoming REM signals by drawing on stored memories, organising otherwise disconnected activity into the narrative that is remembered as a dream."},{"text":"It uses external sensations to build a storyline from the incoming activity.","correct":false,"explanation":"External sensory input is greatly reduced during sleep and does not provide the main material. The cortex uses stored memories to organise incoming activity into a storyline."},{"text":"It uses muscle movements to build a storyline from the incoming activity.","correct":false,"explanation":"Most skeletal muscles are inhibited during REM, so their movement cannot construct the dream narrative. The cortex uses stored memories to build a storyline."},{"text":"It uses logical instructions to build a storyline from the incoming activity.","correct":false,"explanation":"Activation-synthesis does not propose a set of logical instructions guiding dreams. The cortex draws on stored memories to organise random incoming activity into a storyline."}]},{"id":"9dfaeda1-ce43-45d0-bbe3-57aee381ee28","cardType":"cloze","points":null,"front":"Hobson and McCarley put forward activation-synthesis theory in [ ].","back":"Hobson and McCarley put forward activation-synthesis theory in 1977.","mcqOptions":[{"text":"1977","correct":true,"explanation":"Hobson and McCarley first put forward activation-synthesis theory in 1977 as a biological explanation of dreaming based on brain activity during REM sleep."},{"text":"1967","correct":false,"explanation":"This shifts the theory's publication one decade too early. Hobson and McCarley put forward activation-synthesis theory in 1977."},{"text":"1987","correct":false,"explanation":"This decade error places the theory ten years too late. Hobson and McCarley's activation-synthesis theory was put forward in 1977."},{"text":"1997","correct":false,"explanation":"This date is twenty years later than the theory's original proposal. Hobson and McCarley put forward activation-synthesis theory in 1977."}]},{"id":"53af28d1-0847-4186-9a76-865e9c120f46","cardType":"cloze","points":null,"front":"Activation-synthesis theory says dreams begin with [ ] produced during REM sleep.","back":"Activation-synthesis theory says dreams begin with random neural activity produced during REM sleep.","mcqOptions":[{"text":"random neural activity","correct":true,"explanation":"Activation-synthesis theory proposes that dreams begin with random neural activity generated during REM sleep, which the cortex subsequently interprets and organises into a narrative."},{"text":"deliberate memory recall","correct":false,"explanation":"The theory does not claim that dream formation starts with an intentional search of memory. It begins with random neural activity produced during REM sleep."},{"text":"external sensory input","correct":false,"explanation":"External sensory information is limited during sleep and is not the theory's starting point for dreams. Dreams begin with random neural activity produced during REM."},{"text":"complete cortical inactivity","correct":false,"explanation":"The cortex and other brain regions remain highly active during REM, so total inactivity cannot initiate dreams. The theory starts with random neural activity."}]},{"id":"ab02484d-e2af-4103-9fa6-6b9ac3b185f0","cardType":"cloze","points":null,"front":"The dream that is remembered is created by the [ ].","back":"The dream that is remembered is created by the cerebral cortex.","mcqOptions":[{"text":"cerebral cortex","correct":true,"explanation":"The cerebral cortex interprets and organises the random neural activity from deeper brain structures, turning it into the coherent dream that can be remembered."},{"text":"brain stem","correct":false,"explanation":"The brain stem helps regulate sleep and produces signals linked to REM, but it does not create the remembered dream. The cerebral cortex gives the activity meaning and form."},{"text":"limbic system","correct":false,"explanation":"The limbic system contributes emotional content during REM, but it does not create the remembered dream itself. The cerebral cortex organises the random activation into a dream experience."},{"text":"thalamus","correct":false,"explanation":"The thalamus relays neural signals to the cortex and helps regulate consciousness, but it is not responsible for constructing the remembered dream. That role belongs to the cerebral cortex."}]},{"id":"85fd735a-d737-4475-a320-cffb04ff7093","cardType":"cloze","points":null,"front":"Brain restoration takes place during [ ].","back":"Brain restoration takes place during REM sleep.","mcqOptions":[{"text":"REM sleep","correct":true,"explanation":"REM sleep is associated with brain restoration in this account, while the brain remains highly active and most vivid dreaming occurs."},{"text":"deep sleep","correct":false,"explanation":"Deep sleep is mainly associated with physical restoration, so identifying it here confuses bodily repair with the brain restoration linked to REM sleep."},{"text":"light sleep","correct":false,"explanation":"Light sleep is an early, less restorative stage and is not the stage identified for brain restoration. The expected answer is REM sleep."},{"text":"non-REM sleep","correct":false,"explanation":"Non-REM sleep includes stages associated particularly with physical restoration, but this statement refers specifically to brain restoration during REM sleep."}]},{"id":"62e2e56f-510c-45b8-9d19-4ba755d32e08","cardType":"cloze","points":null,"front":"Most dreaming happens during [ ].","back":"Most dreaming happens during REM sleep.","mcqOptions":[{"text":"REM sleep","correct":true,"explanation":"Most dreaming happens during REM sleep, when brain activity is high and the cerebral cortex interprets random activation as a dream."},{"text":"deep sleep","correct":false,"explanation":"Deep sleep is strongly linked with physical restoration and usually involves slower brain activity. Most dreaming is associated with REM sleep instead."},{"text":"light sleep","correct":false,"explanation":"Light sleep can include some dream experiences, but it is not the main stage for dreaming. Most dreaming occurs during REM sleep."},{"text":"non-REM sleep","correct":false,"explanation":"Dreaming can occur during non-REM sleep, but the majority of dreaming is associated with REM sleep, making non-REM sleep too broad and inaccurate here."}]},{"id":"e9392a06-f1ac-4d7e-8dcd-68c68927dbd8","cardType":"cloze","points":null,"front":"The limbic system remains active during REM, producing emotion from random activation with no [ ].","back":"The limbic system remains active during REM, producing emotion from random activation with no event behind it.","mcqOptions":[{"text":"event behind it","correct":true,"explanation":"During REM, random activation can stimulate the limbic system and produce emotions even though there is no real event behind those emotions."},{"text":"memory behind it","correct":false,"explanation":"Memories may influence dream content, but the point is that REM emotion can arise from random activation without an event behind it. 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