Karteikarten
4. Visual Cortex
Karten in diesem Stapel (33)
- 1where is our blind spotwhere our optic nerve is
- 2where do the ganglion fibres in the retina leave to?the optic nerve
- 3what is the point where the optic nerve may sometime cross over to the other hemisphere?optic chiasm
- 4what are the nerves now know as once they've passed the optic chiasm?optic tract
- 5full form of LGNLateral Geniculate Nucleus
- 6what kind of structure is the LGN & where does it receive its' input from?bilateral -- from both the right & left eye, but their information is kept seperate
- 7what are the LGN's receptive fields like?same as ganglion cells' & have centre-surround antagonism
- 8what is V1primary visual cortex
- 9where is it located?at the very back of the brain, as far away from the eyes as you can get
- 10what are the two ways the V1 is organised?retinotopic mapping & cortical magnification
- 11what is RM?where the retinal image received from whats' going on in the retina is mapped out - objects close together in the scene are analysed by neighbouring components
- 12what is CM?refers to how much of the cortex is devoted to representing different parts of the retinal field
- 13which part of the retina is represented the most/by the largest area of the cortex?fovea (8%-10%)
- 14true or false: V1 cells do not have a baseline activityfalse
- 15what stimulus do the receptive fields of V1 cells respond to? who found this?(moving) lines or edges, not spots -- Hubel & Wiesel
- 16what is orientation selectivitywhen the receptive fields are particular about the orientation of the stimulus they respond to & causes them to fire
- 17what are the 3 types of V1 cells with receptive fields?simple cells, complex cells, hypercomplex cells
- 18what is the organisation of the simple cells' receptive field like?same as ganglion with discriminate regions, but elongated like a square or rectangle
- 19what is orientation tuningwhere orientation-tuned neurons give their best response to their preferred orientation, but also respond to other similar orientation
- 20do simple cells display orientation tuning?yes
- 21what stimulus do the receptive fields of complex cells respond to?particular orientation AND direction of movement -- the lines need to be moving & in motion
- 22organisation of RF in complex cellsnot discrete regions
- 23what do they respond best to & least to?horizontal and move downwards, vertical & move upwards
- 24what are hypercomplex cells also known as?end-stopped cells
- 25what are their requirements for a stimulus that makes them fire?particular orientation, direction of movement and length
- 26will a hypercomplex cell respond to a stimulus that is moving in the preferred direction, is or preferred orientation, but longer than preferred?nope
- 27At least how many other areas are there that process visual info?30
- 28what are the specialisations of v3, v4 & v5?v3 = form, v4 = colour, v5 = motion
- 29what are the areas like in terms of their relationship with each other?interconnected with no simple separation of function
- 30what are the two types of processing stream for visual processing beyond V1?dorsal pathway up to the posterior parietal lobe, ventral pathway down to the inferior temporal lobe
- 31what is the 'ventral' stream known as?'what' stream (temporal) - allows us to tell what something is by recognising it & discriminating between objects
- 32what is the dorsal visual stream known as? function?'where' stream (parietal) - know where objects are & aid with visually guided actions like not bumping into others in a corridor
- 33what is the dorsal stream also known as?'how' stream due to its role in visually guided actions
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- Psychology (Intro to Sensation & Perception) Karteikarten am 4. Visual Cortex, erstellt von Reeth G am 17/05/2024.
- Erstellt von
- Reeth G
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