Rapid Serial Visual Presentation (RSVP) Task (abbreviated sequence) •Simulates saccadic vision •Used to gauge speed of visual object recognition Thorpe et al. (1996), Keysers et al. (2001), Johnson & Olshausen (2003) •Barrage style visual oddball (low probability of target image) •Use as a high vigilance stimulus for studying the neural origins of subjects’ response time variability. Fixation (2 seconds) Target RSVP Sequence (100 ms / image)
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Rapid Serial Visual Presentation (RSVP) Task
(abbreviated sequence)
• Simulates saccadic vision• Used to gauge speed of visual object recognition
Thorpe et al. (1996), Keysers et al. (2001), Johnson & Olshausen (2003)• Barrage style visual oddball (low probability of target image)• Use as a high vigilance stimulus for studying the neural origins
of subjects’ response time variability.
Fixation(2 seconds)
Target
RSVP Sequence(100 ms / image)
Single-trial discrimination
Tri
als
Stimulus locked time (ms)
Az
0.5 1p = 0.01
250 ms
0.75
Tri
als
Stimulus locked time (ms)
Az
0.5 1p = 0.01
Tri
als
Response locked time (ms)
Az
0.5 1p = 0.01
Tri
als
Response locked time (ms)
Az
0.5 1p = 0.01
(t)(t) T xwy
,, yy
Xya
T
-200 ms
Discriminationperformance
Quantifying response locking
2
2
2
2ˆ
t
ety
Simulated EEG
Single-trial results
Neural activity becomes strongly response locked during transition from far-frontal to parietal activity
vs.
0-200-400-600-800-1000 200
Response locked time (ms)
AzRL%
p = 0.01
Related Documents
