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Flashcards in Perception - Fitz Deck (11):

What is selective attention

higher order brain centers modify the lower transduction
-can ignore entire systems
-or parts thru filtering


What kinds of factors can influence your sensory perception?

1 - receptor
2 - receptor must be functional
3 - receptor mechanisms (threshold, adaptation)
4 - Selective attention
5 - emotions, experience, etc
6 - drugs


The result of on/off ganglion cells with center/surround receptive fields allows them to respond strongly to:



What part of the brain reassembles a representation of the world?

Visual cortex


Why is strabismus a big deal escpecially for younger individuals?

Strabismus is an imbalance that makes the two eyes have a misalignment of visual axes. After 6 months of age it causes diplopia (double vision) and in younger children the brain can actually suppress the weaker eye and cause permanent decrease in visual acuity. (ambylopia)


Describe how color perception occurs:

Luminescense : Long and medium (red+green) (gives you contrast)
Long/Medium Ratio : Red/green difference
Short - (long+medium) : Blue/yellow difference


If you have a red/green color blindness, what will also be affected?

Visual Acuity


What information is encoded in your ventral stream?

What if you damage it?

Color and form - Acuity
"What" stream

Damage causes Cortical Achromatopsia (keeps you from seeing color and identifying things)


What information is encoded in your dorsal stream?

What if you damage it?

motion and depth perception
"Where" Stream

Damage causes Ideomotor Apraxia (can't execute movements dependent on sight)


Why do “on” ganglion cells (GCs) generate action potentials in response to light in the centre of their receptive field?

Bipolar cells invert the signal coming from the photoreceptors.

(REMEMBER: The inversion only happens in ON ganglion cells)


One form of congenital stationary night blindness is due to a defect in the retina-specific metabotropic glutamate receptor in ON bipolar cells. What would be the MOST DIRECT result of this genetic defect?

Inability to detect colour
Inability to perceive colour
Decreased ability to detect motion
Visual field defects
Ideomotor apraxia

Decreased ability to detect motion