TY - JOUR
T1 - Motion direction, luminance contrast, and speed perception
T2 - An unexpected meeting
AU - Moscatelli, Alessandro
AU - La Scaleia, Barbara
AU - Zago, Myrka
AU - Lacquaniti, Francesco
PY - 2019/6/1
Y1 - 2019/6/1
N2 - Motion direction and luminance contrast are two central features in the representation of visual motion in humans. In five psychophysical experiments, we showed that these two features affect the perceived speed of a visual stimulus. Our data showed a surprising interaction between contrast and direction. Participants perceived downward moving stimuli as faster than upward or rightward stimuli, but only at high contrast. Likewise, luminance contrast produced an underestimation of motion speed, but mostly when the stimuli moved downward. We explained these novel phenomena by means of a theoretical model, accounting for prior knowledge of motion dynamics.
AB - Motion direction and luminance contrast are two central features in the representation of visual motion in humans. In five psychophysical experiments, we showed that these two features affect the perceived speed of a visual stimulus. Our data showed a surprising interaction between contrast and direction. Participants perceived downward moving stimuli as faster than upward or rightward stimuli, but only at high contrast. Likewise, luminance contrast produced an underestimation of motion speed, but mostly when the stimuli moved downward. We explained these novel phenomena by means of a theoretical model, accounting for prior knowledge of motion dynamics.
KW - Luminance contrast
KW - Motion direction
KW - Speed perception
UR - http://www.scopus.com/inward/record.url?scp=85067357987&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85067357987&partnerID=8YFLogxK
U2 - 10.1167/19.6.16
DO - 10.1167/19.6.16
M3 - Article
C2 - 31206138
AN - SCOPUS:85067357987
VL - 19
SP - 1
EP - 13
JO - Journal of Vision
JF - Journal of Vision
SN - 1534-7362
IS - 6
M1 - 16
ER -