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
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