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3 Cortical Structure And Function Notes

Psychology Notes > Perception (2nd year) Notes

This is an extract of our 3 Cortical Structure And Function document, which we sell as part of our Perception (2nd year) Notes collection written by the top tier of Durham University students.

The following is a more accessble plain text extract of the PDF sample above, taken from our Perception (2nd year) Notes. Due to the challenges of extracting text from PDFs, it will have odd formatting:

Cortical structure and function
Organisation of visual cortex

1. Retinotopic maps

2. Magnification factor

3. Orientation columns

4. Ocular dominance columns

5. Hypercolumns

Striate cortex = V1 = visual area  retinotopic organisation within striate cortex
Extrastriate cortex = V2-V5
V1 in occipital lobes
V2 in dorsal and ventral lobes = prestriate cortex - primary region visual assoc
V3 in dorsal and ventral lobes - located in Broadmann's area 19
V4 in ventral lobe
V5 in temporal lobe

Retinotopic maps
= measuring the spatial rep of the retinal image in the cortex  helps to understand how the visual world is represented
Describes where diff locations on the retina are represented
Tootell et al., 1982: V1 is retinotopically organised
 Injected a monkey with deoxiglucose that is taken up by active neurons
 Showed the monkey a flickering grating  looked at the cortical tissue
 Saw a grid-like pattern of activity in the cortical tissue after the monkey had looked at a grating for a prolonged period
 visual stimuli are laid out in an orderly and organised way in the visual cortex = retinotopic organisation
Spatial RFs:
When measuring the RF locations of V1 neurons that are in the same column perpendicular to the cortical surface = they are in approx. the same location
A move of 1mm = separate RF
When moving along the cortical surface = RF locations will change in an orderly fashion,
corresponding to the locations in the visual image
Hypercolumns = contains neurons sensitive to all orientations and to both eyes
Each hypercolumn represents all features in one location of visual space

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