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Related Experiment Videos

Postcoincidence trajectory duration affects motion event perception.

K Watanabe1, S Shimojo

  • 1California Institute of Technology, Computation and Neural Systems, Pasadena 91125, USA. kw@caltech.edu

Perception & Psychophysics
|April 17, 2001
PubMed
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Bounce-inducing factors require time to interact with post-coincidence trajectories (PCT) for maximum effect. This challenges cognitive bias theories, suggesting a temporal interaction is key to visual perception.

Area of Science:

  • Visual perception
  • Cognitive psychology
  • Motion perception

Background:

  • Visual targets moving in 2D displays can be perceived as bouncing or streaming.
  • A strong tendency exists for the streaming percept, but bounce-inducing factors can alter this.
  • Factors like sound or visual flashes at coincidence can induce bouncing.

Purpose of the Study:

  • To investigate the temporal dynamics of bounce-inducing factors after visual target coincidence.
  • To determine the optimal duration for post-coincidence trajectory (PCT) interaction with bounce-inducing stimuli.
  • To test the cognitive-bias hypothesis versus a temporal interaction hypothesis for bounce induction.

Main Methods:

  • Participants viewed identical visual targets moving toward and across each other.

Related Experiment Videos

  • Bounce-inducing factors were presented at the moment of visual target coincidence.
  • The duration of the post-coincidence trajectory (PCT) was systematically varied.
  • Participants reported their perception (bouncing or streaming).

    • Main Results:

    • The percentage of bouncing percept increased with PCT duration.
    • Maximal bounce-inducing effect was observed for PCT durations of 150-200 msec.
    • The effect was not immediate but developed over time after coincidence.

    Conclusions:

    • Bounce-inducing factors require a temporal interaction with the post-coincidence trajectory (PCT) to be maximally effective.
    • The results reject the cognitive-bias hypothesis for bounce induction.
    • A time-dependent interaction mechanism is proposed for visual motion perception shifts.