A group of researchers design an experiment to measure human reaction times to different sensory modalities. They measure the reaction times of ten participants in response to either an auditory stimulus (a high-pitched beep) or a tactile stimulus (a brief vibration on the wrist). Each participant must press a response button as quickly as possible upon detecting the stimulus.
The table below shows the reaction times, in seconds, for the ten participants:
| Participant | Auditory reaction time (s) | Tactile reaction time (s) |
|---|---|---|
| 1 | 0.15 | 0.21 |
| 2 | 0.17 | 0.19 |
| 3 | 0.15 | 0.22 |
| 4 | 0.19 | 0.24 |
| 5 | 0.16 | 0.20 |
| 6 | 0.18 | 0.23 |
| 7 | 0.15 | 0.21 |
| 8 | 0.20 | 0.25 |
| 9 | 0.16 | 0.22 |
| 10 | 0.17 | 0.20 |
(i) Find the mode of the reaction times for the auditory stimulus. (ii) Calculate the median of the reaction times for the auditory stimulus.
Identify the stimulus in the auditory reaction time test.
Complete the sequence representing the nervous pathway for this response:
Stimulus→I→Sensory neurone→Central Nervous System (CNS)→II→Effector→Response \text{Stimulus} \rightarrow \text{I} \rightarrow \text{Sensory neurone} \rightarrow \text{Central Nervous System (CNS)} \rightarrow \text{II} \rightarrow \text{Effector} \rightarrow \text{Response} Stimulus→I→Sensory neurone→Central Nervous System (CNS)→II→Effector→ResponseState the names of structures I and II.
135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.