PSY 162 Lecture Notes - Lecture 10: Oliver Sacks, Parietal Lobe, Temporal Lobe

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1 Jun 2018
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Cortical Cells
Hypercomplex cells
Respond to movement in particular orientations
Have areas of excitation & inhibition
Critical for detecting edges and orientations
Hierarchical Organization
We have cells in our visual cortex representing each orientation at each point in the visual
field
At each successive state in visual processing-
Neurons become selective for more precise features
The Role of the What System
The what system is located in the temporal lobe
When this region is damaged-
Difficulty recognizing objects
Can also develop difficulty identifying color
Visual form agnosia
The case of Mrs. R
Can be incredibly specific
(She can say the watch has a circle and has number son it but she cannot name. If she
touches it she can name it)
The what system can be divided into form & color systems
Color system has less acuity
Oliver Sacks wrote about an artist who lost his ability to see color
Could still recognize objects but lost a lot of enjoyment in life
Peoples grey skin grossed him out
He couldn’t look at food while he ate it
Began to only eat achromatic foods (olives, rice etc)
Located in the parietal lobe
When this system is damaged-
Ss cannot tell where objects are on the world
Trouble seeing motion & depth
Telling left from right
Seeing complex objects as whole
Equiluminant Colors
Different colors w/ equal luminance
Can be seen by the what system-
But invisible (poorly seen) to the colorblind where system
Artists have recognized these as special
Report a sense of movement/vibration
These are hard to make
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Document Summary

We have cells in our visual cortex representing each orientation at each point in the visual field. At each successive state in visual processing- Neurons become selective for more precise features. The what system is located in the temporal lobe. Can be incredibly specific (she can say the watch has a circle and has number son it but she cannot name. If she touches it she can name it) The what system can be divided into form & color systems. Oliver sacks wrote about an artist who lost his ability to see color. Could still recognize objects but lost a lot of enjoyment in life. He couldn"t look at food while he ate it. Began to only eat achromatic foods (olives, rice etc) Ss cannot tell where objects are on the world. Can be seen by the what system- But invisible (poorly seen) to the colorblind where system. Doesn"t work the same under all lighting conditions from all distances.

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