The Parts of the eye and vision

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Presentation transcript:

The Parts of the eye and vision

Transduction: Conversion of physical energy to a neural impulse Vision transduce light energy Hearing transduce sound waves Touch transduce pressure/temperature Taste transduce chemicals Smell transduce chemicals

How do we see? 1. Gathering Light 2. Within the Eye 3. Transduction 4. In the Brain

To the thalamus…. (REVIEW) Optic nerve sends impulses to the LGN (lateral geniculate nucleus) located in the Thalamus

In the visual cortex… (REVIEW) Visual cortex receives impulses that activate feature detectors (groups of neurons that respond to different types of visual images such as vertical lines, curves, motion and other features)

Perception (REVIEW) What we perceive visually is a combination of different features Association area helps us organize and recognize images

How do we see color?

Trichromatic theory (Young and Helmholtz) 3 types of cones in the retina (detect blue, red and green) These cones are activated in different combinations to produce all the colors of the visual spectrum * DOES NOT EXPLAIN AFTERIMAGES *

OPPONENT-PROCESS THEORY (HERING) Sensory receptors are arranged in the retina in pairs (red/green, yellow/blue, black/white) If one of the pair is stimulated, the other is inhibited from firing *EXPLAINS AFTERIMAGES *

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