Visual Fields

KW 8-20

Fovea on

Cortex

KW 8-22

Occipital Lobes are Independent

KW 8-24

Visual Areas

Areas V1 – V5

KW 8-17

Visual Cortex

Figure 6.16  Receptive fieldsThe receptive field of a receptor is simply the area of the visual field from which light strikes that receptor. For any other cell in the visual system, the receptive

field is determined by which receptors connect to the cell in question.

Receptive Fields

Neural Activity

KW 8-25

Overlap in Receptive Fields

KW 8-27

Simple Cells 1

KW 8-29

Hubel and Wiesel

Nobel Prize Winners

Mapping the Visual Cortex

Simple Cells 2

KW 8-29

Complex Cells

KW 8-30

Neural Basis of Visual Perception

The Cerebral Cortex: The Shape PathwayHubel and Wiesel’s Cell Types in the Primary Visual Cortex

Simple CellsStraight lines in particular orientation

Complex Cells Straight lines in particular orientation in motion

Hypercomplex cells Edge detector (edge in motion)

Hypercomlex Cell

KW 8-31

Column Organization

KW 8-34

Lesions in visual cortex

KW 8-39

Dorsal and Ventral Streams

KW 8-14

Where

What

What and Where Cortical Areas

Neural Basis of Perception

Disorders of Object Recognition

Visual Agnosia- Inability to Recognize Objects

Prosopagnosia- Inability to recognize faces

Contralateral Neglect - neglect left side of visual world

Injury to the “What” Pathway

KW 8-40

Temporal Columns

KW 8-35

Monkey Face Cells

Mona Lisa Flip

Mona Lisa Pair

Raderscheit Self-portraits

2 mo

6 mo

3.5 mo

9 months after right parietal stroke

Neglect

Left Visual Field Right Visual

Left Brain

Right Brain

Neglect Example 1

Left Visual Field Right Visual

Left Brain

Right Brain

Neglect Example 2

Left Visual Field Right Visual

Left Brain

Right Brain

Neglect Example 3