PS101 Chapter Notes - Chapter 4: Absolute Threshold, Neural Adaptation, Color Blindness
Document Summary
Psych exam review chapter 4: perception & sensation. Weber"s law states size of a just noticeable difference (jnd) is a constant proportion of size of initial stimulus: as stimuli increase in magnitude, the jdn becomes larger. Fechner"s law states the magnitude of a sensory experience is proportional to number of jnds that the stimulus causing experience is above absolute threshold. Perceptions cannot be measured on absolute scales. Perception without awareness can take place (the advertisement where it says sex in the ice-cubes to attract consumers unconsciously) Sensory adaptation: gradual decline in sensitivity due to pro-longed stimulation: ex. Jumping into cold water= cold at first, okay after few moments. (your body adapts to the temperature: sensory adaptation is automatic, and built in. Most objects don"t emit light, they reflect it (sun, lamps, fireflies are exception) In bright light, pupils constrict to take advantage of shaper image. In dimmed light, pupils dilates to allow more light into retina.
