Rapid Serial Visual Presentation (RSVP) Task (abbreviated sequence) Simulates saccadic vision Used...

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