KIN 155 Lecture Notes - Lecture 1: Visual Cortex, Optic Nerve, Occipital Lobe

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Photoreceptors in retina synapse onto optic nerve: optic nerve fibres project to two main systems: Geniculostriate visual system: primary visual system in humans. Optic nerve synapses to neurons in v1 area of the occipital cortex: v1 = primary visual cortex (striate cortex) Dual visual stream hypothesis: vision is used for action (where) and perception (what) Some suggest that visual processing: for action involves (dorsal posterior parietal lobe) for perception involves (ventral temporal lobe) Psychophysics - quantitative study of perception, examining the relations between stimuli and responses. (cid:858)ps(cid:455)choph(cid:455)sical(cid:859) do(cid:373)ai(cid:374)s. Top-down (brain is on top) concept-driven - prior knowledge, expectations are critical. Bottom-up (sensory from below) data-driven sensory details are critical. Optical flow or optic flow is apparent motion objects around you caused by the relative motion of person to the environment. Saccades: fast movement to next target ex: looking at keyboard or faces. Smooth pursuit: following an object moving along ex: looking at a baseball.

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