Prosopagnosia
The inability to recognize faces
Action Potentials
A brief pulse of electrical current that is generated by a neuron, and may be transmitted to neighboring cells
Cones:
-Short
-Medium
-Long
Color-sensitive receptor cell in the retina, primarily for daytime vision.
Short- blue light
Medium- green light
Long - red light
Psychic Blindness
The ability to see is intact but the significance of certain objects is not recognized
Neurotransmitters
A chemical secreted by neurons that carries signals between them across neurons
Rods
A sensory neuron in the outer edge of the retina. Sensitive to low intensity light and specialized for night vision
Akinetopsia
The inability to perceive motion
Photon
Fundamental unit of all light and electromagnetic radiation
Opsins
Pigment molecules that prompt the absorption of different wavelengths of light
Visual Agnosia
“Anton Babinski Syndrome.” Inability to recognize familiar objects, despite having normal vision
Photoreceptor Cells
Cells within the retina that detect light and contain retinals that change shape when a photon collides with it
Blind spot
Created by the presence of the optic disc
Saccades
Short, back and forth darting movements
Herman Boerhaave
Founder of clinical teaching and the modern academic hospital
Hermann Munk
Discovered psychic blindness by intentionally damaging the occipital lobes of dogs
Greeble
Computer-generated artificial objects used as stimuli in psychological studies of facial recognition
Sterogram
2d image that allows the viewer to see a 3d shape
The “Where” Pathway (Dorsal)
Carries signals triggered by a visual stimulus from the visual cortex to the parietal cortex. Gathers information about motion and timing that is integrated in to the “action” plan.
The “What” Pathway (Ventral)
Goes through a series of visual processing areas, each adding a specific area of perception (color, depth, etc). The information continues until it’s assessed for meaning and significance
Top-Down Processing
The brain uses existing knowledge, expectations, and context to interpret incoming visual stimuli
Bottom-Up Processing
Perception begins with raw sensory data received by the eyes (lines, shapes, colors)
Layers of light-sensitive rods and cone cells; contains three layers of cells
Retina
Transparent disks that adjusts to focus light rays
Lens
The hole in the iris that narrows in bright light/widens in dark light
Pupil
