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Lab Block 2 - vision Brain and Behavior Spring 2022.pdf -...

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Practical laboratoriesblock 2Visionfrom sensation to perceptionBrain and BehaviorNYU PragueSpring 2022Eduard Kelemen
Visionfrom sensation to perceptionWhat we see depends on our expectations and our pre-existing understanding of theworld.Sensation (input about the world available to sensory receptors) is transformed intoperception (organization and interpretation of sensory inputs).This can be illustrated using optical illusions.Brain can construct…… objects… colors… shapes
Program:Blind spot testMach bandslateral inhibitionColor processing:Color adaptationColorblindnessColor interactionMultistable perceptionMuller-Lyer illusionSpatial illusionsVisionfrom sensation to perception
Blind spot testClose your right eyeLook at the circle with the left eyeMove your eye closer to and further away from the picture.At some distance the plus sign should disappear.Close your left eyeLook at the plus sign with the right eyeMove your eye closer to and further away from the picture.At some distance the circle should disappear.
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Blind spot, optic discColumbia Eye ClinicBasit and Egerton, 2013
Fovea centralisColumbia Eye Cliniclight
Mach bandsSeeing shades of gray that are not thereEach of the six rectangles has homogeneous color.Close to the border between darker and lighterrectangles - the darker rectangle looks evendarker and lighter rectangle looks even lighter.
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Mach bandsexplanation bylateralinhibitionsensoryneurons“downstream”neuronsinhibitoryneurons

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Ishihara

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