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cog chp 3 top 5
Visual Processing Pathway (Eye, LGN, Visual Cortex, Dorsal and Ventral)
| Question | Answer |
|---|---|
| Two things that come with Perception of constructing reality | Perception Akinetopsia |
| Define Perception | Allows us to interoperate the world around us |
| What happens with Akintopsia? | You see things in sequenced rays rather than smoothly |
| What do your senses pickup? | Touch: pressure Sound: Airwave disturbances Taste: chemical Smell: Chemical Vision: waves |
| Environment to the brain process | 1) Stimulus from external 2)Receptors of periphery 3)Thalamus 4)primary cortex 5)beyond Eye-> Thalamus-> Occipital cortex |
| What helps us see? | Cornea and Lens work with light in order for retina to process the information being seen |
| What is the Retina made up of | Photoreceptors (cones and rods) Ganglion cells Bipolar cells |
| Define Rods | Low light active color-blind None in the fovea |
| Define Cones | High Light active In fovea Short, medium, Long |
| Define Red-blue Colorblindness | Missing medium cones or they don't work |
| What are the colors of each cone? | Short: Blue Medium: Green Long: Red |
| Define Fovea | Many cones few rods details and color |
| T or F, Saccades and Fixations don't allow the fovea to move in order for the fovea to capture images | F |
| Define blind spot | The optic nerve ends No photoreceptors |
| What happens to center surround cells in the LGN/ Thalamus | Center: Faster firing rates Surrounding: slower firing rates Whole: Constant, nothing |
| What makes up the visual processing pathways | Thalamus Visual Coding Dot Detectors |
| Define Parallel Processing | Speed Mutual influence requires multiple systems |
| What is LGN ? | Lateral Geniculate nucleus Responsible for vision confirmation sensory signals from the body goes to opposite hemispheres |
| Define visual coding | single celled relationship between stimulus and nervous system response |
| Role of MT | Sensitive to speed of movement |
| Role of V4 | sensitive to color and shape |
| Role of V1 | Edge detection ' First cortical representation |
| Define Multiple Receptive fields | Orientation= edge Motion=movement corners angles less similarity=less firing |
| What system is known as the ___ | Ventral system |
| Define Ventral System | connected to occipital lobe and inferotemporal cortex Aids in identification of visual objects FFA and PPA Damage= visual agnosia (difficult recognizing objects |
| Where system is known as ___ | Dorsal system |
| T or F, Damage to Ventral system = visual agnosia | T |
| T or F, Damage to Dorsal system= visual ataxia | T |
| define the dorsal system | connected to occipital and posterior parietal cortex Knowing in where objects are located Damage= Difficulty reaching objects (visual ataxia) |
| Patient D.F. had damaged her ventral stream which meant she could draw pictures from memory but not | copy and object exactly or recognize her own drawings |
| Define The Binding problem | seeing similar colors or letters and mistaking them Conjunction error |
| 3 way in solving the binding problem is | Spatial position Neural synchrony Attention |
| Define neural synchrony | Group of brain cells firing at the same time |
| T or F, Insufficient attention doesn't lead to conjunction errors | F |
Created by:
Melis2003
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