PSYC 2390 Lecture Notes - Absolute Threshold, Psychophysics, Evoked Potential

• School: University of Guelph
• Department: Psychology
• Course: PSYC 2390
• Professor: Lana Trick

Document Summary

Jan 10th sensation and perception: action potentials cont. transfer of ions that occurs has an effect on the membrane potential which is measured with a volt meter. A dim light might have 200 a. p. per second whereas a bright light would have. 400 a. p. intensity of a sense can be determined through number of action potentials per second but there is a limit 500 to 800 a. p. per second if something is too intense, the cell cannot signal it anymore. Unmyelinated axons must have an exchange of ions throughout the entire axon; but this is not the case for mylenated axons (ions can jump) that is called salutatory conduction. At the end of an axon there are the pouches" called synaptic vesicles; electrical charges cause neurotransmitters to be released through the synaptic gap to other axons granted that there is an action potential: excitatory effects.