PMID- 10497428
OWN - NLM
STAT- MEDLINE
DCOM- 19991102
LR  - 20190822
IS  - 0031-5117 (Print)
IS  - 0031-5117 (Linking)
VI  - 61
IP  - 6
DP  - 1999 Aug
TI  - Motion perception over long interstimulus intervals.
PG  - 1066-74
AB  - Recent studies using moving arrays of textured micropatterns have suggested that 
      motion perception can be supported by two mechanisms, one quasilinear and 
      sensitive to the motion of luminance-defined local texture, the other nonlinear 
      and coding motion of contrast-defined envelopes of texture (Baker & Hess, 1998; 
      Boulton & Baker, 1993b). Here we used similar patterns to study motion perception 
      under conditions previously shown to isolate the nonlinear mechanism (low 
      micropattern densities and positive interstimulus intervals [ISIs]. We measured 
      direction discrimination for two-flash apparent motion over a much larger range 
      of ISIs, and susceptibility to masking by incoherently moving "distractor" 
      micropatterns. The results suggest that two nonlinear mechanisms can support 
      motion perception under these conditions. One operates only for relatively short 
      ISIs (less than c. 100 msec), is sensitive to small spatial displacements, and is 
      relatively insensitive to distractor masking. The other operates over much longer 
      ISIs, is insensitive to small spatial displacements, and is highly disrupted by 
      distractor masking. These results are in line with previous studies suggesting 
      that three mechanisms support motion perception.
FAU - Bex, P J
AU  - Bex PJ
AD  - McGill University, Montreal, Quebec, Canada. bex@psy.gla.ac.uk
FAU - Baker, C L Jr
AU  - Baker CL Jr
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Percept Psychophys
JT  - Perception & psychophysics
JID - 0200445
SB  - IM
MH  - *Attention
MH  - Contrast Sensitivity
MH  - Humans
MH  - *Motion Perception
MH  - Nonlinear Dynamics
MH  - Optical Illusions
MH  - Orientation
MH  - *Pattern Recognition, Visual
MH  - Perceptual Masking
MH  - Psychophysics
MH  - *Reaction Time
EDAT- 1999/09/25 09:00
MHDA- 2001/03/28 10:01
CRDT- 1999/09/25 09:00
PHST- 1999/09/25 09:00 [pubmed]
PHST- 2001/03/28 10:01 [medline]
PHST- 1999/09/25 09:00 [entrez]
AID - 10.3758/bf03207614 [doi]
PST - ppublish
SO  - Percept Psychophys. 1999 Aug;61(6):1066-74. doi: 10.3758/bf03207614.