PSYC1003 Lecture Notes - Lecture 10: Visual Agnosia, Prosopagnosia, Information Processing

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21 Jun 2018

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Psychology 1003 October 12th & 14th

The Retina

Adaptation: becoming more or less sensitive to light as needed

Information processing: -receptive fields (Figure 4.10)

Vision and the Brain

Light > rods and cones > neural signals > bipolar cells > ganglion cells > optic nerve > optic chiasm >

opposite half brain >

Optic chiasm: the point at which the optic nerves project into the brain

Main pathway: lateral geniculate nucleus (thalamus) > primary visual cortex (occipital lobe)

Second pathway: superior colliculus > thalamus > primary visual cortex

Hemi-spatial Neglect

Feature detectors: - microelectrode recording of axons in primary visual cortex of animals

- Discovered feature detectors: neurons that respond selectively to lines, edges,

etc.

The Visual Cortex

Visual agnosia: inability to recognize objects

Prosopagnosia: inability to recognize faces

System: Perceiving Colour

Processing Colour Vision

Wavelength: colour – Longer=red/shorter=violet

Amplitude: brightness

Purity: saturation

-Subtractive colour mixing: Paints

-Additive colour mixing: Lights

Theories of Colour Vision

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