Beads Task

Frequently Asked Questions

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Overview

Sample beads from two jars with different proportions and infer the source, assessing probabilistic reasoning under uncertainty.

How to operate

Draw beads step‑by‑step, decide when to commit or keep sampling. Decision steps and accuracy are logged.

Outputs

Decision steps, accuracy, and the full sampling sequence.

Export

CSV/JSON export supported.

Source

This adaptation follows the beads task used by Garety & Hemsley (Garety, Hemsley, & Wessely, 1991), with jars in an 85:15 ratio. In research, this paradigm is used to study the 'jumping to conclusions' (JTC) reasoning style. This page is an educational demonstration: your number of draws describes your sampling in this session and must not be used to draw conclusions about any individual's reasoning or mental health.

References

  • Phillips, L. D., & Edwards, W. (1966). Conservatism in a simple probability inference task. Journal of Experimental Psychology, 72(3), 346-354. 10.1037/h0023653
  • Huq, S. F., Garety, P. A., & Hemsley, D. R. (1988). Probabilistic judgements in deluded and non-deluded subjects. Quarterly Journal of Experimental Psychology Section A: Human Experimental Psychology, 40(4), 801-812. 10.1080/14640748808402300
  • Garety, P. A., Hemsley, D. R., & Wessely, S. (1991). Reasoning in deluded schizophrenic and paranoid patients: Biases in performance on a probabilistic inference task. Journal of Nervous and Mental Disease, 179(4), 194-201. 10.1097/00005053-199104000-00003

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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.

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

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