visual_cog_08 - Visual Cognition September 11, 2008...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Visual Cognition September 11, 2008 Overview of Visual Cognition Visual system: mission critical Multivariate inputs, unitary experience Multiple types of vision means many types of units in a distributed visual network Segregating vs. parsing Visual experience reveals nature of underlying representations Theory >> data Whos Coming to Dinner? Gestalt Psychology (interested in basic dimensions of perceptual organization) Cognitive Psychology (interested primarily in effects of cognitive operations on visual experience) Cognitive Neuropsychology (interested in effects of selective lesions of visual cortex on visual behavior) Electrophysiology (interested in single- and multiple-unit activity of cells in visual cortex) Cognitive science (interested in developing overall theories of visual experience and object recognition) Sensation and Perception Sensation : Conscious outcome of sense organs and projection regions. (I detect something, not necessarily conscious, and not necessarily meaningful) Perception : means by which information acquired from the environment via the sense organs is transformed (organized) into conscious experiences of objects, events, sounds, tastes, etc. (I know, recognize, appreciate what I am sensing, and it means something to me) Three Stages of Visual Processing Reception: absorption of physical energy by receptors Transduction: translation of physical energy into electrochemical activity of the nervous system Coding: how information is encoded and represented; relationship between aspects of the physical stimulus and resultant nervous system activity (e.g., rate, temporal patterning of neuronal activity) Population coding Sparse coding Basic Perceptual Phenomena You Already Know About Size and Shape Constancies : reflect mechanisms whereby perception of a distal object stays the same despite proximal changes in the perception implies storage of a structural representation Depth Cues: monocular or binocular sources of information that convey information about relative distance o f objects from viewer involve cues about the structure, movement, and proximity of objects Object vs. Spatial Vision (Mishkin & Ungerleider) General principle: inferior lesions produce perceptual impairments; superior lesions produce syndromes dominated by spatial impairment Milner & Goodale: Perception-Action Model Alternative to the Mishkin-Ungerleider model Dorsal: How do I interact with that object?...
View Full Document

This note was uploaded on 12/01/2011 for the course CLP 7934 taught by Professor Staff during the Fall '08 term at University of Florida.

Page1 / 82

visual_cog_08 - Visual Cognition September 11, 2008...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online