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Lecture 6

CGSC 1001 Lecture Notes - Lecture 6: Saccade, Long-Term Memory, Ovulation


Department
Cognitive Science
Course Code
CGSC 1001
Professor
Jim Davies
Lecture
6

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Percepon
What is Percepon?
oThe process by which agents interpret and organize sensaon to
produce a meaningful experience of the world.
oFrom a cognive science perspecve, it means turning
informaon from one form into meaningful representaon.
Typical Sensory “Modalies”
Physical Signal Perceptual Modality
Light Vision
Air Vibraons Hearing, echolocaon
Physical Pressure Touch
Chemicals Taste and Smell
Body Posion Kinesthecs
Human Vision
oExtra mission Theory
Rays of light emanang from the eye in combinaon with
light in the world allows us to see
Salute in army
oIntromission Theory
Visual percepon is accomplished by rays of light re/ected
from the objects into the eyes
Human Eye
oLight is re/ected into the eye and focused on the rena
oLight smulates the rod and cone receptors
oTransducon of light into electricity
Rods and Cones on Rena
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oThe image is severely distorted and inverted
oRod: the most light sensive photorecepve cells in the rena
(night vision):
100X more sensive than cones
informaon is received by a convergence or pooling from
many rods cells resulng in a loss of visual acuity;
convergence of informaon makes peripheral vison
sensive to movement (seeing something in the corner of
your eye).
Cone: Three Types:
oCorrespond to Short (blue)
oMedium (green)
oLong wavelengths (red); works best in bright light; fewer cone
cells exist for peripheral vision
Depth Percepon
oSize
We know how big things are
oPerspecve
Things are smaller on the fovea as they go further
oOcclusion
When one thing in in the front cell
oTexture, Shading, Saturaon
Closer things are more saturated. Texture gradients.
oFocus Mulple Images
Including moon and binocular vision
Dorsal and Ventral Streams
oDorsal: “where” pathway; associated with moon,
representaon of object locaons, and control of the eyes and
arms, especially when visual informaon is used to guide
saccades or reaching.
2
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