060409 - The Vision System

060409 - The Vision System - The Vision System Psychology...

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The Vision System Psychology 1101 Lecture – Dave Van Valkenburg 06/05/09 The Visual Pathways - Information crosses over - Optic tract o Information travels across - Superior colliculus o Orienting the movements of head and eyes - Prectectum o Reflex control of pupil and lens - Hypothalamus o Regulation of circadian rhythms - Striate cortex o Enables conscious perception - Fovea o Point of central focus - Cornea o Outer protective layer o Bends light - Iris o Changes size of pupil - Lens o Bends light - Perception o Gets information and interprets it - Optic nerve leaves eye o Blind spot - The eye is incredibly sensitive to light changes - Some control of light level inside the eye is achieved by changing Iris diameter - The pupil dilates o If we are looking at, or talking to, someone/something we find attractive - The retina contains different light-sensitive cells [photoreceptors] o Facing towards the back of the eye o Rods not sensitive to colour low levels of light limited amounts of detail *** o Cones centrally located at the fovea sensitive to colour
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