Psychology 1000 Chapter Notes - Chapter 5: Retinal Ganglion Cell, Subliminal Stimuli, Ganglion Cell

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

Document Summary

Sensation: how do we perceive the world around us. Psychophysics: relation between physical stimuli and psychological response. Change brightness and ask people when they notice it. Allows for comparison of physical and psychological intensity. Threshold: value of stimulus characteristics required to produce some response. Only vision and hearing are good for humans. Not a 1:1 for perceived brightness (physical and psychological intensity) Size of a difference threshold relative to the physical intensity of test is constant (delta i)/i =c. Intensity of 50db and jnd at 55 db then c=0. 1 [55-50)/50] You can predict what jnd would be at other intensities. Smaller fraction of constant= the more sensitive the system (1/60 better than 1/10) If it is 1/60, then if you change it 1/60th, then you"ll be able to tell the difference. Can"t be a linear system, such as weber"s. Subliminal messaging to buy food during movie, but it didn"t have enough time to be picked up subliminally.