Time constants in the perception of a change in the direction of motion in humans.
Motion signals are subject to spatio-temporal filtering at early stages of processing. In general, motion can be characterized by two parameters: speed and direction. This study sought to determine the time constants for the filtering of the directional component of the motion signal. In a forced-choice discrimination task, subjects were asked to choose the more abrupt change in direction of a target that moved through two 90 degrees corners. At each corner, direction of motion was low-pass filtered. Subjects were able to reliably perform this task if the filter time constants differed by >20 ms.
Soechting
John F
JF
Department of Neuroscience, University of Minnesota, 6-145 Jackson Hall, 321 Church Street S.E., Minneapolis, MN 55455-0250, USA. soech001@umn.edu
Mrotek
Leigh A
LA
Flanders
Martha
M
D002755:Choice Behavior / Q000502:physiology; D004192:Discrimination, Psychological; D004215:Distance Perception / Q000502:physiology; D006801:Humans; D009038:Motion; D009039:Motion Perception / Q000502:physiology*; D010775:Photic Stimulation; D011594:Psychometrics / Q000379:methods; D017603:Signal Detection, Psychological; D013028:Space Perception / Q000502:physiology; D013996:Time and Motion Studies