Class Notes (836,517)
Canada (509,851)
Psychology (5,217)
PSYCH 2E03 (70)

Vision for Cognition and Vision for Survival (2).docx

4 Pages
Unlock Document

Gautam Ullal

November 2 , 2012 Psych 2E03: Sensory Processes Vision for Cognition and Vision for Survival (2) Two streams - dorsal stream/how stream: vision for action, context of locating the object in space Ventral stream and further divisions of dorsal stream - ventro-dorsal stream to inferior parietal lobe - dorso-dorsal stream to superior parietal lobe Special attributes of dorsal stream - motion detection  object pursuit: superior parietal lobule also called dorso-dorsal pathway, fast in detection of motion (online), detection of object  space/depth perception: especially medial temporal and inferior parietal lobule, also called ventro-dorsal pathway, detection of coherence in motion Determining direction of fields of moving dots (newsome’s expt. Cont’d) - coherence as low as 1 to 2% elicits a significant response in the MT and a behavioural response from the monkey - stimulation and lesion experiments - lesioning experiment by Newsome and pare:  normal monkeys can detect motion with coherence of 1 or 2%  monkeys with lesions in MT cortex cannot detect motion until the coherence is 10 to 20% - a monkey judges the motion of dots mov ing horizontally to the right - when a column of neurons that prefer downward motion is stimulated, the monkey judges the same motion as being downward and to the right Perception of 3’D - top: gradient stimuli - bottom: response of neurons in the parietal cortex (close to the posterior end of intraparietal sulcus) to each gradient Special attributes of dorsal stream - stron luminance-contrast sensitivity compared to ventral stream - strong response to varying locations of o
More Less

Related notes for PSYCH 2E03

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.