Attention Flashcards
Cortical Blindness
Blind in both eyes due to a bilateral lesion in V1. People can still avoid objects even though they cannot see them. This is cos they have no damage to their eyes and they still send signals just not to V1 and beyond
Blindsight
Behaviour can still be guided by surroundings in patients with cortical blindess
Multimodal Processing
The integration of information from different sense to form a coherent percept
What may cause synthesia
A cross activation of one cortical area by another. It can arise at various stages along the visual pathway
Arousal
A global physiological and psychological state of an organism. Ranges from deep sleep to hyper-alertness
Selective Attention
Ability to prioritise and attend to some things and not others
Goal Driven Control
Top-down control where attention is steered by someone’s current goals
Stimulus driven control
Bottom up control where it is steered by stimul
Dorsal Attention Network (Frontoparietal)
Involved in task-specific, goal directed control of attention
Ventral Attention Network
Involved in stimulus driven attention, detection of salient targets and reorientation of attention
Strongly lateralised to the RIGHT HEMISPHERE
Patients with damage to the superior colliculus ?
Have difficulty shifting their attention and are slow to respond to cued targets
Patients with damage to the pulvinar of the thalamus
Have difficulty in attentional orienting
Neglect can occur due to impairment where?
The ventral cortical network
What are two parts of the ventral cortical network?
The Inferior Parietal Lobe (IPL)
Superior Temporal Gyrus (STG)
When a patient has damage to the _____ they space based neglect
Inferior Parietal Lobe
When a patient has damage to the ____ they object based neglect
Superior Temporal Gyrus
Neglect
When the brain’s attention network is damaged in one hemisphere.
Vision is not impaired but they only pay attention to the side that is opposite of their unilateral brain damage
Extinction
When a previously visible stimulus in one half of the visual field is not consciously reported whena. stimulus appears in the other half of the visual field
Endogenous Attention
Voluntary Attention is our ability to attend ton something
Exogenous Attention
Reflexive Attention is when a sensory event captures our attention (A survival mechanism)
Covert Attention
When you covertly attend to a stimulus (Your eyes are on a book but you are listening to something behind you)
Overt Attention
When you turn your head to a stimulus for example
What did Helmholtz discover about attention
When you focused your eyes on a specific place on a screen you could covertly attend to any location on the screen
Early Selection
The idea that a stimulus can be seen as irrelevant before perceptual analysis is done
Late Selection
The perceptual system processes all inputs equally and THEN selection takes place at higher stages of processing
Voluntary Spatial Attention
Responses to the same physical stimuli are larger when they are focuses in than when they are ignored.
This difference is called the P1 wave.
There is a difference in V1 and V2 neurons with cell activation even when the stimulus is the same as there is a shift in attention not the stimulus
Reflexive (Exogenous) cuing method
Tests how task irrelevant events somewhere in the visual field affects the speed of responses to task-relevant target stimuli.
