visual perception Flashcards
Observable behaviour + verbal recounting of behaviour = consciousness (T/F)
FALSE - case of parasomnias, blindsight
Milner and Goodale propose that we have 2 visual systems________ of which include consciousness
only ONE of which incl consciousness
Zombie agents refer to ______________
sensory motor systems that carry out specialised behaviour rapidly, WITHOUT conscious awareness
may require consciousness for regulatory feedback but mostly no need
Simple visual input, short processing time, steoreotyped motor outputs is characteristic of________ visual system
Zombie agents
The seeing system incorporates __________ features
complex info, greater motor variability, longer processing, consciousness, object centred coordination,
Describe CFS
- One eye is presented with moving stimuli, second presented with TARGET
- Very difficult to find it, BUT occular tracking shows that we spend majority of the time looking at it (but arent able to report bc unconscious)
the function of sight is to____________
absorb external info about the world through light
The cornea and the lens function to________
FOCUS image
eye movements can be measured by_____________
1) frequency of blinks
2) pipillary response
3) Saccades
4) Saccadic suppression
5) fixational eye movements
6) micro saccades
7) tremors
In relation to sccades + micro saccades, tremors are_________
SMALLER
Saccadic suppression refers to__________
zombie agents condensing info from when our eyes dart around involuntarily, = we see an edited version that suppresses what we see during darting around. Can see in others but not in self
Microsaccades function to
bring image back to the centre of the vision
Retinal ganglion cells are____________
cells summarising info form receptors + communicating this via AP’s
The optic nerve is made of____________
RGC axons
RGC are sufficient for conscious vision
FALSE
Achromatopsia – specific deficit in colour perception due to__________
damage to the FUSIFORM GYRUS
Blindsight occurs when ________
lesion to the V1
The 3 types of fixational eye movements are and we________ conscious of it
Drift, tremor, microsaccade
UNCONSCIOUS
Fixational eye movements are very small and therefore do not affect visual processing (T/F)
FALSE - are small and therefore affect individuals neurons differently = constantly changing perception
How is lucid dreaming tested /verified
ask people in their dreams to do SMOOTH PERSUIT –> smoothly follow an object in their dreams
Saccadic eye movements are
Refer to large, voluntary eye movements
The major types of eye movements are
Saccadic eye movements
Smooth pursuit
Vergence (moving of BOTH eyes for binocular vision)
How was the blind spot generated?
is a thick bundle of nerves where there is a lack of photo receptors
Why might it be suggested that Octopus’s eyes are vetter organised ?
Their photoreceptors are located immediately behind the lens = don’t have thick layers of cells + don’t have blind spot = EFFICIENT
