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Perception lec 6.docx

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Matthias Niemeier

Perception lec 6 Short answer question : cant contrast diff wavelenghts, so each cone is not dedicated to a color, you cant tell diff between diff colors see diff shades of luminescence. If you only have 1 type of cone receptor. There is a same response to diff wavelengths. Prob is theya re not specific respond to a range rather than just 1. Get an output from photoreceptors just 1 type of output, how stimulated photoreceptor is depends on wavelength and intensity. So all kinds of mixes will yield same output. To be solved there are more color cones -eye movements refresh retina so there;s no adaptation -we need to make eye movements to move the fovea around, they are almost speficically designed for vision and mostly nothing else -eye movements are the simplest kind of movements Eye movements -based on 6 muscles in the eye -3 dimensions of rotation, in each dimension there are 2 directions so that’s y you need 6 eye muscles -rectus eye muscles: on top and bottom on tempora (lateral)l side and nasal (medial) side -oblique eye muscles: inferior and superior -eye movements are controlled by 3 cranial nerves: III (occulomotor, innervates all eye muscles besides 2 ipsilaterally) IV (superior oblique muscle- trochlear nerve contralateral eye) and VI (abducens, eye has moved away from the nose, innervates pull eye left pull eye right ipsilateral) -eye movements are controlled by cerebral cortex, we can make conscious eye movements -attention based on high eye motor control -kinds of eye movements:  Smooth pursuit: Eyes can move smoothly when they follow moving objects  Saccades: eye movements we make all the time, jerky like eye movement , change fixation  Vergence: convergence: come together, divergence: separate, gonna need for depth perception  Fixations: eye movement that focuses -many photoreceptors being stimulated, less sensitivity -things are moving we need to follow them with our eyes -eye movements are meant for optimizing vision and can mess around with your vision -vision is interpreted diff depending on whether you believe moving or not Saccade: move eyes as quickly as possible to the object of interest -100s of thousands of eye movements everyday -there is something going across the retina that’s there when we move our eyes, sort of like a smear -spatial constancy: problem with discriminating motion across the retina due to eye motions vs obect movements -why don’t we see the world shaking with eye movement? -saccadic eye movement: motion eye movement doesn’t work well, it is suppressed -how does the brain know when to suppress? -compensation theory: 7 sense, efference can be copied like a photocopy and it can be sent back to visual system, -comparator compensates: the brain is not aware the eye is moving but the retina is, sense the world as shaking when touch eyeball -efference copy (eye tapping) not only demonstration The comparator: -there is motor cortex sends out through superiorcolliculous and cause eye movement and dot of darkness projected onto retina is smearing across -so efference copy (collirary discharge) if its going into comparator and info about retina movement shows there was no movement Space perception -cues are conveyed through just one eye -binocular cues-stereopsis -euclidian geometry: parallel lies remain parallel as they extend in space -object of a certain size will remain that size as they move around in space -things don’t change size as you approach or move away from them -objects you walk away from become smaller because they take up less space on our retina -we don’t sense directly we sense projection of Euclidian geometry -1 sense that perceives Euclidian geometry: touch -parallex: vantage point of 2 eyes is slightly different -binocular disparity: basis of stereopsis. Gives us the sense of things sticking out -monocular depth cues: derived from a sin
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