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6: The Cortical Representation

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Presentation on theme: "6: The Cortical Representation"— Presentation transcript:

1 6: The Cortical Representation
Human Perception 6: The Cortical Representation

2 Overview of the Visual Cortex
Human visual areas

3 Overview of the Visual Cortex
Human visual areas

4 Visual Areas in Lateral and Medial Views of Occipital Cortex
GIRKIN AND MILLER Surv Ophthalmol 45 (5) March–April 2001 Fig. 3. Posterior lateral view of the human visual cortex showing sev-eral of the visual associative areas. The cerebellum has been removed and the hemispheres have been separated and displaced to display medial and lateral occipital re-gions. V1 corresponds to the pri-mary of striate visual cortex. The other associative visual areas are discussed in the text except V7, V8, and LO (lateral occipital, which plays a role in object processing), because these areas have not been associated with distinct clinical syn-dromes. (Artist: Juan Garcia.)

5 Overview of the Visual Cortex
Human visual areas V1 V2 V3 V3A V4 Posterior Anterior cm

6 occipital lobes, posterior view
Visual areas occipital lobes, posterior view V1 V2 V3 V3a V4v The position of the visual areas on the folded brain. MT+ cm left right

7 Retinotopic Organization
Receptive field location in the human calcarine sulcus

8 Visual Field Mapping Phase-Encoded Retinotopies (Engel et al

9 Eccentricity Maps Lateral Medial SH/081798

10 Eccentricity Maps Dorsal view Occipital 20 deg WAP TOS Parietal

11 Retinotopic organization
Methods to estimate the receptive field location

12 Exposed Calcarine Retinotopy (Horton and Hoyt, 1994)

13 Organization of V1 Upper VM HM 80 Lower VM

14 Cortical Magnification and Rod Free Zone
1.2 cm Rod free zone 22 deg

15 Retinotopic Areas On A Human Brain
Sagittal Visual area Foveal confluence V1 V2 V3 V3B V3A hV4 V7 Ventral Dorsal

16 Electrical Stimulation of Area V1
Visual phosphene Human

17 Electrical Stimulation of Area V1
Visual phosphene Human

18 Center-Surround: LGN/Retina
Dualism-mind is separate from the body Descartes believed that the pineal body directed fluid from the ventricles into the holow fibers we call nerves-this induced muscle action. The pineal gland is where the soul controls the physical body Monism: the belief that the mind is the working of the body (no need for a separate soul. Determinism-the notion that mental states are produced by physical mechanisms. Reductionists-we break complex phenomena into less complicated sytems.

19 Orientation Sensitivity
Best orientation Dualism-mind is separate from the body Descartes believed that the pineal body directed fluid from the ventricles into the holow fibers we call nerves-this induced muscle action. The pineal gland is where the soul controls the physical body Monism: the belief that the mind is the working of the body (no need for a separate soul. Determinism-the notion that mental states are produced by physical mechanisms. Reductionists-we break complex phenomena into less complicated sytems.

20 Primary Visual Pathway
Dualism-mind is separate from the body Descartes believed that the pineal body directed fluid from the ventricles into the holow fibers we call nerves-this induced muscle action. The pineal gland is where the soul controls the physical body Monism: the belief that the mind is the working of the body (no need for a separate soul. Determinism-the notion that mental states are produced by physical mechanisms. Reductionists-we break complex phenomena into less complicated sytems.

21 Visual Pathways: LGN

22 The Architecture of Area V1
V1 is a layered structure

23 Modules in Visual Cortex

24 Cytochrome Oxidase blobs in V1

25 Columnar architecture in other areas
Direction columns in MT “Feature” columns in IT

26 Visual Area Hierarchy


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