Dot Motion Coherence

Judge the coherent direction of moving dots across coherence levels and review per-level accuracy. Descriptive results; export supported.

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Overview

A random-dot kinematogram (RDK): dots move inside a circular area, and a fixed share of them moves coherently to the left or right while the rest move randomly. You judge the coherent direction across coherence levels (5-40%).

How to operate

Watch the fixation cross. The dots move for 0.8 s, then you have 2 s to answer: F = left, J = right, or use the on-screen buttons.

Outputs

Accuracy and median response time per coherence level, plus per-trial records. Results are descriptive only - 80 trials are not enough to estimate a perception threshold.

Export

CSV/JSON export supported.

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About this experiment

This is a random-dot kinematogram (RDK), the standard laboratory paradigm for studying motion perception. On each trial, 100 dots move inside a circular aperture for about 0.8 seconds: a share set by the coherence level (5-40%) moves together to the left or right, while the remaining dots move in random directions. Your goal is to judge the coherent direction.

How to Play

Keep your eyes on the central fixation cross. A cloud of dots appears and moves for about 0.8 s, then disappears.
Press F if the coherent motion was to the left.
Press J if the coherent motion was to the right.

References

Newsome, W. T., & Paré, E. B. (1988). A selective impairment of motion perception following lesions of the middle temporal visual area (MT). Journal of Neuroscience, 8(6), 2201-2211. 10.1523/JNEUROSCI.08-06-02201.1988
Britten, K. H., Shadlen, M. N., Newsome, W. T., & Movshon, J. A. (1992). The analysis of visual motion: A comparison of neuronal and psychophysical performance. Journal of Neuroscience, 12(12), 4745-4765. 10.1523/JNEUROSCI.12-12-04745.1992
Shadlen, M. N., Britten, K. H., Newsome, W. T., & Movshon, J. A. (1996). A computational analysis of the relationship between neuronal and behavioral responses to visual motion. Journal of Neuroscience, 16(4), 1486-1510. 10.1523/JNEUROSCI.16-04-01486.1996

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About This Experiment

This experiment is an educational adaptation for demonstration purposes. It is not a clinical diagnostic tool. Results reflect your performance in this specific session and should not be interpreted as an assessment of your cognitive abilities.

Data Privacy

Your experiment data is processed and stored locally in your browser. No data is uploaded to any server unless you explicitly export it.