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15 Cards in this Set
- Front
- Back
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What are the 2 functional visual streams in frogs? |
Visuo-motor control module Visuo-spatial module |
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The visual streams run ___________ from the ____ to the _____ and _______________ areas which are responsible for executing actions |
independently, eye, brain, motor output |
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The visual streams involve the _____________, which is similar to the superior colliculus in primates |
optic tectum |
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Routes from the eye to the brain: mammals |
Retain the evolutionary older midbrain /optic tectum linked with visual procsses operating outside our conscious experience Also developed the geniculate striate pathways - give rise to our subjective visual experience |
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Evicence of damage to the geniculate-cortical pathway is ____________________ |
Cortical blindness |
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Evidence of damage to the tectal/collicular pathway is neglect ___________________ |
Neglect |
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Evidence of damage to the geniculate-cortical pathway includes |
achromatopsia movement impairment visual agnosia prosopagnosia topographical agnosia agraphia |
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Blind sight |
caused by the destruction of the PVC can perceive visual features, but this occurs outside of conscious awareness |
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Neglect |
caused by damage to the superior colliculus results in an impairement in orienting to the left or right side of visual space |
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Mishkin and Ungerleider (1981) damaged the geniculate-cortical pathway of monkeys and suggestsed that |
primates have two functional streams within the cortex - Identification of objects - 'what' (ventral) stream -Spatial location of objects - 'where' (dorsal) stream |
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Role of the ventral stream |
Identification of possible and actual goal objects The selection of an appropriate course of action to deal with those objects |
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Role of the dorsal stream |
implementation of the course of action selected by the ventral stream via - detailed specification and online control of the constituent movements that form the action -Making use of metrical visual information that maps directly onto the action in the 'here and now' |
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Patient DF |
CO poisoning Bilateral damage along the VENTRAL stream Parietal lobe not damaged - dorsal stream intact The effect was visual form agnosia - able to control actions, but cannot recognise them objects, but cold orient her arm and hand appropriately for the object |
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Findings suggest that DF uses visual information, yet she doesn't see anything. Therefore, she shows a dissociation between |
what she can consciously recognise AND what she can actually do |
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The perception-action hypothesis |
The ventral stream is for perception - giving rise to object and scene recognition The dorsal stream, in contrast, is for perception-for-action - Using visual information for the online control of action |
