Flashcards
Colour perception
Flashcards do conjunto (15)
- 1What are the three cone types and what is their peak absorption?-S cones - 420nm - Blue
-M cones - 533nm - Green
-L cones - 564nm - Red - 2WHat is the peak absorption of rods?498nm
- 3What are the two types of chromatically opponent RGC's?-Type 1 - Red/green opponent centre-surround RF's
-Type 2 - Red/green or blue/Yellow spatially overlapping opponent RF's - 4What ganglion type do the blue/yellow opponent end up in?Small bi-stratified
- 5What ganglion type do the red/green opponent end up in?Midget
- 6What three transformations occur to the chromatic information when processed in V1?-Amplification of blue yellow channel (5x)
-Cross channel mixing where CO blobs have bridges between R-G & B-Y RF's
-Within channel mixing where R-G blobs of opposite signs have bridges to increase chromatic contrasts - 7Which part of the occipital lobe is specialized for colour perception and constancy?The lingual gyrus
- 8What happens following a neurological legion of the lingual gyrus?Achromatopsia or dyschromatopsia (mild) - selective deficit in colour perseption
- 9What is congenital/inherited dichromacy?Where only 2 types of cones have functioning pigments.
- 10What is deutanopia?No green colour perception
- 11What is protanopia?No red colour perception
- 12What is tritanopia?No blue colour perception
- 13What other deficits are associated with achromatopsia?-Upper quadrantanopia (damage to lower bank calcarine sulcus)
-Form agnosia & prosopagnosia (damage to LOC-lateral occipital cortex for object recognition & fusiform face area) - 14What is colour constancy?A bid to keep the perceived colour independent of variations in the spectral content of the illuminant. PFG responsible for this.
- 15Name two parts of cortex are involved in colour perception-V4, Lingual gyrus
-Posterior Fusiform Gyrus (colour discrimination & past experience)
Informações
- Descrição
- Bachelors Degree visual science FlashCards sobre Colour perception, criado por krwanabe em 03-12-2015.
- Criado por
- krwanabe
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