The attending brain Flashcards
overt orienting vs covert orienting
overt: moving eyes or head to direct attention
covert: attention shifts without movement of eyes or head
exogenous vs endogenous cuing
exogenous: attention externally guided by stimulus
endogenous: attention guided by perciever
what is the attentional blink?
attentional blink: inability to report a target stimulus if it appears soon after another target stimulus
3 types of spatial representation
- retinotopic: location on sensory surfaces
- egocentric: location relative to the body
- allocentric: location relative to other objects
Treisman: feature integration theory
single feature search: “pop out” - preattentively, parallel search
conjunctive search: attentively, serial search
two process theory
2 independent, sequential stages of processing
- preattentive processing (parallel)
- attentive processing (serial)
what is negative priming?
- stimulus is distractor
- stimulus is target
- > increased reaction time
- > semantic processing of unattended stimuli
what is pseudo neglect?
non lesioned brain is asymmetrical
-> tendency to attend to left side of visual field
what is extinction?
in patients with neglect
stimuli compete against each other
patients with neglect:
see stimulus A if stimulus B is absent
don’t see stimulus A if stimulus B is present
explain the premotor theory of attention
attention as preparation for movement
switching against direction costs more effort than switching with direction
1 2 3 4
3->4 = easy
3->1 = hard
what are
line bisection
cancellation task
?
used to detect neglect:
line bisection - judging central point of line
cancellation - search targets in array and striking them
3 symptomes of balint’s syndrome
- simultanagnosia
- optic ataxia
- optic apraxia
simultanagonisia: what is possible, what not
top down: possible
bottom up: not possible
patients can group parts if they share color, shape or if they connect
