Chapter 6 Lecture - Perception

Receptive field

  • Maximum response

  • Minimal response

Recording from the visual cortex

  • Hubel and Wiesel → retinal ganglion cells

  • → in cortex, response is to slit of light

  • → cortical cells may be orientation specific and motion sensitive

  • Simple cell → fires to slit at a particular orientation on a specific retinal location

  • Complex cell → moving slits at particular orientation

  • Hypercomplex cell → combination of stimulus features and bug detectors and grandmother cells

  • Colour vision → theories of colour vision ie trichromatic amd opponent process

  • Hearing

- parts of the ear

- place theory versus fluency theory

-Hearing loss

  • Other sensory systems

→ green al operation of taste smell and touch

Perception:

Gestalt approach → max wetheimer

  • principles of grouping

-similarity

-proximity

-continuity

-connectedness

-closure

-subjective contours

  • importance of expectation and context

Depth perception

  • binocular : retinal

  • Monocular : relative six overlap, linear perspective, texture gradient

  • Linear perspective

  • Texture gradient

Size constancy

-rescale the size of objects so that they remain constant at any distance

-learned (first coupe of months)

-many visual illusions reflect inappropriate scaling

-retains size pitted against linear perspective

Perceptual problem solving

-feature analysis is a bottom up