Psychology 1000 Lecture Notes - Proprioception, Psychophysiology, Power Law

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Dr.Mike

Document Summary

Psychophysics: relation between physical stimulus and psychological response. Value of stimulus characteristic required to produce some respose. Hearing: tick of a watch at 6m. Taste: tsp. of sugar in 8l. of water. Smel: 1 drop of perfume in a 6 room apt. Touch: wing of a fly on cheek from 1 cm so whats the realtion? brightness and perceived brightness not a 1-1 relation weber"s law. Size of difference threshold relative to physical intensity of test is constant delta i/i = constant. If i = 50db and a jnd is reported at 55db. E. g whats a jnd @ 100 db? deltai = 10. A jnd would occur @ new test +10 = 11-db or new test 10 = 90db. The relative difference is: can compare sensitivity of different systems the smaller deltai/i is the better it is vison(brightness) = 1/60 kinesthesis(weights) =1/50 pain(thermal)=1/30 audition(mid pitch moderater loudness) =1/10 pressure(skin)=1/7 smell(india rubber)= taste(salt)1/3. Sensation increases with the logarithm of intensity.