Visual Cognition (student)

Visual Cognition - Visual Cognition I Modularity in the Pattern Recognition System A Konorskis(1967 Visual Recognition Taxonomy-Small manipulable

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Visual Cognition I. Modularity in the Pattern Recognition System A. Konorski’s (1967) Visual Recognition Taxonomy -Small, manipulable objets -Larger, partially manipulable objects -Non-manipulable objects -Human faces________________ -Emotional facial expressions -Animated______________ objects -Signs -Handwriting__________________ -Positions of limbs__________ B. Farah (1992) 1. Domain-Specific Recognition Systems -Faces (Prospopagnosia___________________) -Objects (Agnosia____________) -Words (Alexia__________) 2. Dissociations in Neuropsychology IMPAIRED INTACT # Cases Faces Objects, Words Faces, Objects Words Faces, Ob, W none Words Faces, Objects Not included Objects, Words Faces Objects Faces, Words 1? Faces, Words Objects 1?
Background image of page 1

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

View Full DocumentRight Arrow Icon
3. Holistic vs.Decompositional Processing -Tanaka & Farah (1992) --Subjects taught to idenstify a set of faces + objects (e.g., houses) --When tested with _parts__________ from objects (e.g., door of a house), subjects better at recognizing than part of a face (e.g., nose) --Faces less decomposable than objects_____________ 4. Farah’s Conclusions -Face recognition is holistic______________ -Word recognition is more decompostional__________________ -Object recognition system shares strategies of both II. The Visual System A. The Eye -Iris & Pupil
Background image of page 2
-lens______ -Retina_______ -Rods -Cones -Bipolar Cells -Ganglion_______ Cells -Optic Nerve -Optic Chiasm___________ -Lateral Geniculate Nucleus (LGN) B. Primary Visual Cortex --On/Off Center Cells
Background image of page 3

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

View Full DocumentRight Arrow Icon
--V1 receptive fields: response of a simple cell -Feature Detectors/ Simple Cells, sensitive to Orientation______________ Part of the VF Size____________ V1 receptive fields: response of a complex cell --Complex cells sensitive to: Line Orientation Movement_____________ in a given direction
Background image of page 4
--Hypercomplex Cells have inhibitory_______________ regions at each end, thus: Maximally respond to lines of a given orientation if they are not too long C. The Visual Brain Cortical Areas: -V1: Primary Visual Cortex -V2: Relays visual signals to other areas -V3: F__________ and M_________ (V3a) -V4: F_______ and C_________ (activated by objects but not scrambled objects (Grill-Spector et al., 1998) -V5: M___________
Background image of page 5

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

View Full DocumentRight Arrow Icon
D. Bifurcation of visual systems into --”where:” dorsal___________ (occipitoparietal) pathway -- “what:” ventral___________ (occipitotemporal) pathway --Milner & Goodale: recognition/action systems
Background image of page 6
III. Recognizing 2-D Stimuli A. Template Matching Theory 1. Holistic_____________ match to stored representation 2. Relatively inflexible_____________ system 3. Mismatches_______________ based on size, orientation, etc. 4. Too much variety—violates Cognitive economy__________________ 5. Prototype templates________________, the “average” of a class of stimuli, more flexible representations (e.g, Palm pilot_______________) B. Feature analysis Theory 1. Stimuli broken into component lines 2. Similar patterns distinguished from each other on basis of distinctive
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/17/2010 for the course PSY 43785 taught by Professor Reed during the Spring '10 term at University of Texas at Austin.

Page1 / 19

Visual Cognition - Visual Cognition I Modularity in the Pattern Recognition System A Konorskis(1967 Visual Recognition Taxonomy-Small manipulable

This preview shows document pages 1 - 8. Sign up to view the full document.

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