Class Notes (839,394)
Canada (511,324)
Psychology (3,528)
PSY100H1 (1,637)

LEC 5-Psychophysics

5 Pages

Course Code
Michael Inzlicht

This preview shows pages 1 and half of page 2. Sign up to view the full 5 pages of the document.
Psychophysics -sensation is the stimulation of sense organs -preception is the selection, organization and interpretation of sensory input Thresholds -sensory receptors are tuned to a particular form of energy -auditory receptors in the ear code for sound pressure changes, not for light -sensory systems require a minimum amount of energy of activation (absolute threshold) -Just-noticeable difference (JND): the minimum difference in stimulation that is just noticeable -Weber noted that the JND is a fraction of the original stimulus intensity; the fraction is different from different sense The Visual System -the eye detects electromagnetic radiation (light) -vision is functional -allows for detection of movement (predator or prey?) -allows for detection of colour (ripe or spoiled?) -light detection is useful because -light travels rapidly (no delay, unlike hearing) -light travels in a straight line (no distortion) -light interacts with the surface of objects in the environment (reflected or absorbed) Transduction of Light -light travels through the retina to impinge on photoreceptors at the back of the eye -light bleaches a pigment contained within the photoreceptors -bleaching leads to a graded receptor potential that eventually produces an action potential in the ganglion cell -two types of photoreceptors 1. cones: found in the center of retina (fovea) and are sensitive to fine details and colour 2. rods: found in periphery of retina and are sensitive to movement but not fine detail
More Less
Unlock Document

Only pages 1 and half of page 2 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.