08_Vision_I_6 - multiple receptors, ganglion cells from...

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Psychology 2: Introduction to Psychology Day 8 topics Anatomy of the eye Transduction of light From eye to brain The “big picture” with vision Sensory information Eye–thalamus – occipital lobe Questions to address: How does the eye process light? Light info Æ neural signal? How do we process color? Consolidating information? Information pathway to brain? Sensation vs. perception Transduction Psychophysics From the environment to brain Light energy Properties of light waves: (1) Length (color) (2) Amplitude (brightness) (3) Purity (saturation) Gross anatomy of the eye Blind spot: Fig 4.8 in book The lens and accommodation
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The fovea Rods vs. cones Distribution in retina? Transduction in the eye 1. Light enters eye 2. Refracted back to retina (image inverted) 3. Reaches back of eye, activates rods/cones (receptor location) 4. Bipolar, ganglion cells, head to exit the eye 5. Information leaves the eye via the “blind spot” Information consolidation Bipolar and ganglion cells act to summarize information Bipolar cell represents info. from
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Unformatted text preview: multiple receptors, ganglion cells from multiple bipolar cells Receptive field of a neuron Challenge : still needs to represent location/intensity of activation Receptive fields Numerous (and overlapping) receptive fields help map precise information seen in the environment! How do we process color? Trichromatic theory Pattern across cones yields unique colors Color opponent theory Some colors work against others Red/green, blue/yellow Explains image after effects Information leaves the eye Visual fields Each eye, half a visual field Optic chiasm Nasal fields cross Visual field, side of brain Synapse on thalamus How does the eye process light? Synapse on occipital lobe Primary visual cortex (V1) Single neurons in V1 code for features! As processing in brain advances, neurons represent more complicated features! Two streams of processing What does the brain want to know? What is out there? (Ventral, temporal lobe) Where is it? (Dorsal, parietal lobe)...
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08_Vision_I_6 - multiple receptors, ganglion cells from...

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