Psychology 1000 Lecture Notes - Lecture 13: Retina, Cornea, Outer Ear

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Mike Atkinson

Document Summary

Psychophysics: relation between physical stimulus and psychological response. Can determine a just noticeable difference (jnd) Threshold: value of a stimulus characteristic required to produce some response, absolute threshold: lower limit, difference threshold: amount of change for jnd. Not a 1 to 1 relation: we(cid:271)er"s la(cid:449) Size of a difference threshold relative to physical intensity of test is constant ( i/i = c) Change is noticed from 55db to 50 db. The value of jnd is not constant, but the relative difference is. The smaller the (cid:448)alue of c, the (cid:862)(cid:271)etter(cid:863) the se(cid:374)siti(cid:448)it(cid:455) of the s(cid:455)ste(cid:373) For exam: know how to calculate c, know how to identify what values of. Fe(cid:272)h(cid:374)er"s la(cid:449: sensations increases with the log of intensity (s = k log i) compare ( i/i = c, more general and cognitively economic. Te(cid:448)e(cid:374)"s po(cid:449)er la(cid:449: s = k log in, more predictive across a variety of sensation.