Psychology 100:12 Chapter 5 Sensation & Perception Part III.

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Presentation transcript:

Psychology 100:12 Chapter 5 Sensation & Perception Part III

Outline Basic Sensory Processes Vision Transduction Colour Receptive fields Feature detectors Study Question: Compare and contrast the trichromatic theory of colour vision with the opponent process theory of colour. Relate these theories to the Law of Complimentary and the Three Primaries Law.

Vision: The Physical Stimulus Vision

Sensation The Eye Vision

Sensation Vision: The Retina Vision

Sensation Rod and cone vision –Cones >Specialized for colour and acuity >concentrated in fovea –Rods >Specialized for sensitivity in dim light >concentrated in periphery –Both contain a photochemical that reacts to light (in the rods: rhodopsin) –Two reasons why rods are more sensitive to light 1.Rhodopsin is more sensitive to light 2.Density of cones in the fovea Vision

Sensation Colour Vision –The colour of objects is determined by pigments –Subtractive colour mixing >Colour perception is created by absorption of wavelengths of light Vision

Additive Colour Mixing –When coloured lights are mixed, two laws apply: >Three Primaries Law >Law of Complimentarity

Vision

Two Theories of colour vision –Trichromatic theory > -> the three types of receptors are sufficient for colour perception

Opponent Process theory –Trichromatic theory does not account for complimentary colours. –Colour vision is mediated by cells that can be excited or inhibited –Blue- Yellow, Red - Green, & brightness Vision

Contrast Coding of Contrast and Contour –Three examples of exaggerated contrast

Contrast Coding of Contrast and Contour –Three examples of exaggerated contrast

Contrast Coding of Contrast and Contour –Three examples of exaggerated contrast

Contrast heightening Contrast Coding of Contrast and Contour –Receptive fields and on-off areas

Hermann - Hering grid Coding of Contrast and Contour Contrast

Receptive fields and the Hermann-Hering illusion Coding of Contrast and Contour Contrast

Feature detectors –Hubel and Weisel > Simple cells - edge detectors > Complex cells - edges at particular angles > Hypercomplex cells - angles and length – Higher level feature detectors: Motion detectors Vision

Feature detectors More From Ramachandrin Vision