04_Visiual+Recognition+_+Agnosia

04_Visiual+Recognition+_+Agnosia - VisualRecognition...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
    Visual Recognition
Background image of page 1

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

View Full DocumentRight Arrow Icon
Visual Processing Millions of computations are performed on the  light patterns that fall on the retina before we  see images consciously. Much of what goes on in the brain during  vision is unconscious (prior to awareness).   Processing begins with  Sensory  Registration , as shown in the next slide.
Background image of page 2
Visual system divides into three  pathways Thalamus Pulvinar nucleus Lateral geniculate nucleus Superior Colliculus Retina Ganglion cells bipolar cells photoreceptors Midbrain (eye movements) Optic tract divides into 3 paths: Cortex Parietal Primary visual
Background image of page 3

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

View Full DocumentRight Arrow Icon
Visual Pathways As shown in the previous slide, after sensory  registration the visual pathway divides into: The  eye-movement pathway  (superior colliculus) How pathway  for all other movements (parietal  cortex) Damage to how pathway causes visual apraxia. What pathway  (occipital cortex) Produces visual perception Damage produces visual agnosia
Background image of page 4
Visual Recognition Sensory Registration Feature Analysis Patterns are constructed from features activated in  the primary visual cortex (occipital lobe) by visual  inputs. Local form features such as shape and color are  invariant under orientation Global, spatial, relational features are defined against a  fixed orientation Integration
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/17/2011 for the course PSYCHOLOGY 830:303 taught by Professor Staff during the Fall '10 term at Rutgers.

Page1 / 21

04_Visiual+Recognition+_+Agnosia - VisualRecognition...

This preview shows document pages 1 - 6. Sign up to view the full document.

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