Unit 4: Sensation & Perception

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Presentation transcript:

Unit 4: Sensation & Perception Vision

The Stimulus Input: Light Energy Transduction (transform) Wavelength Hue (color) Intensity Wave amplitude

Electromagnetic Energy Spectrum

Electromagnetic Energy Spectrum

Electromagnetic Energy Spectrum

The Physical Property of Waves

The Physical Property of Waves

The Physical Property of Waves

The Physical Property of Waves

The Physical Property of Waves

The Eye Cornea Pupil Iris Lens accommodation Retina

The Structure of the Eye

The Structure of the Eye Cornea = outer covering of the eye.

The Structure of the Eye Pupil = the adjustable opening in the center of the eye through which light enters.

The Structure of the Eye Iris = a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening. The iris dilates/constricts in response to changing light intensity

The Structure of the Eye Lens = the transparent structure behind the pupil that changes shape to help focus images on the retina.

The Structure of the Eye Retina = the light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information.

The Eye The Retina Rods and Cones Rods Cones

Rods versus Cones

The Retina’s Reaction to Light

The Retina’s Reaction to Light

The Retina’s Reaction to Light

The Retina’s Reaction to Light

The Retina’s Reaction to Light

The Eye The Retina Optic nerve Blind spot Fovea

The Structure of the Eye Blind Spot = the point at which the optic nerve leaves the eye, creating a “blind” spot because no receptor cells are located there.

The Structure of the Eye Fovea = the central focal point in the retina, around which the eye’s cones cluster.

The Structure of the Eye Optic Nerve = the nerve that carries neural impulses from the eye to the brain.

Visual Information Processing Visual Cortex

Pathways from the eyes to the visual cortex

Pathways from the eyes to the visual cortex

Pathways from the eyes to the visual cortex

Pathways from the eyes to the visual cortex

Visual Information Processing Feature Detection Feature detectors

Visual Information Processing Parallel Processing Blind sight

Visual information processing

Visual information processing

Visual information processing

Visual information processing

Visual information processing

Visual information processing

Young-Helmholtz trichromatic (three color) theory Color Vision Young-Helmholtz trichromatic (three color) theory Red – Green - Blue Monochromatic vision Dichromatic vision

Opponent-process theory Color Vision Opponent-process theory Three sets of colors Red-green Blue-yellow Black-white Afterimage

After image