Presentation is loading. Please wait.

Presentation is loading. Please wait.

VISUAL PATHWAYS Organization of LGN of thalamus Organization of Visual Cortex What Stream How Stream The Binding Problem.

Similar presentations


Presentation on theme: "VISUAL PATHWAYS Organization of LGN of thalamus Organization of Visual Cortex What Stream How Stream The Binding Problem."— Presentation transcript:

1 VISUAL PATHWAYS Organization of LGN of thalamus Organization of Visual Cortex What Stream How Stream The Binding Problem

2 LGN Organization Retinotopic maps Six Layers – Three from ipsilateral eye – Three from contralateral eye

3 Visual Cortex Organization Location columns Orientation columns Ocular dominance columns Hypercolumns

4 What and How Streams What Stream (Ventral Pathway) – Pattern recognition – Projects to the temporal lobes How Stream (Dorsal Pathway) – Location and movement – Projects to the parietal lobes Crosstalk between pathways

5 What Stream Input from Parvocellular ganglions P-cell layers in LGN Visual Cortex Inferotemporal Cortex - form

6 More on the Inferotemporal Cortex Some neurons respond best to faces – Fusiform Face Area Damage causes prosopagnosia Experience determines what patterns the neurons respond to

7 How Stream Input from Magnocellular ganglions M-cell layers in LGN Visual Cortex Medial Temporal Cortex (MT) - movement Parietal Lobes

8 The Binding Problem Information about the same stimulus is represented in many different brain areas How do we combine this information into a unitary perception? – Synchronized firing of neurons – Waves of firing

9 Sensory Coding Sensory Code - pattern of neural responses that represents perception of the environment – Specificity Coding - specialized neurons respond to particular stimuli – Distributed Coding - the pattern of response of many neurons


Download ppt "VISUAL PATHWAYS Organization of LGN of thalamus Organization of Visual Cortex What Stream How Stream The Binding Problem."

Similar presentations


Ads by Google