PSYC1110 Lecture Notes - Lecture 9: Acetylcholine, Nicotinic Acetylcholine Receptor, Exocytosis
15 Oct 2016
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Using reaction time as a measure of psychological processes. Helmholtz measured speed of impulse in frog nerve in. Rejection of vital force notion, believe it is measurable. Nerve impulse could travel at the speed of light. How can the speed of the impulse be measured, separately from the stimulation and recording. Often see wit rt: changes with practice(gets faster, sensitive to expectancy and strategy, shows a speed-accuracy tradeoff. Problem: includes the time to sense the stimulus, contract the muscles to make the response, and the time for all the (cognitive) processes in between. So: helmholtz"s subtraction method: two experiments, equate all but one aspect of the process, since only one small piece differs, differences in. Rt are likely due to how long it takes for that process: speed of neural impulse. See how long it takes for signal to arrive at brain from more proximal(neck) and more remote (ankle) parts of the body.
