Clinical evaluation
Cognitive
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vroddoneoutgame
Odd One Out
Discover the hidden rule, find the different one — reasoning and mental flexibility
Shimmering glass boxes float before the patient; all follow a hidden rule except one — and discovering the rule itself is part of the exercise.
Gameplay
The key therapeutic point: the rule is never told; discovering it IS the exercise. Sometimes the difference is color, sometimes category (leaves and one animal), sometimes orientation, sometimes the finest detail.
At advanced levels the rule changes without notice, and the patient must read the feedback, realize the old rule no longer works, and change their mind — direct training of cognitive flexibility. Errors carry no punishment: at the end of each round the correct answer is gently revealed.
Motor complement
The array can open wide enough that searching demands neck and trunk rotation; touch mode adds real reaching too.
Therapeutic purpose
Odd One Out trains conceptual reasoning and classification, and — through silent rule shifts — cognitive flexibility: letting go of the old strategy to find the new rule.
- Weak reasoning and problem-solving
- Mental rigidity (difficulty changing strategy)
- Cognitive rehabilitation after brain injury, and aging
Clinician guide
This exercise is fully built and now in final preparation for release. Rule type, box count, spatial span and distraction are configured in the Level Designer.
- Follow the news section for the release announcement.
Recorded metrics
- Accuracy in finding the odd one
- Decision speed
- How fast the patient adapts after a silent rule change
- Performance under distraction
علم و شواهد
Odd One Out targets conceptual reasoning, visual classification and — above all — set-shifting: the ability to abandon one response rule and discover a new one, one of the three pillars of executive function.
Scientific basis
The exercise follows the logic of the Wisconsin Card Sorting Test (WCST): the person must infer a hidden sorting rule from feedback and, when the rule silently changes, switch strategy (Grant & Berg, 1948; Heaton et al., 1993). Mental flexibility (shifting) is one of three core executive functions alongside updating and inhibition (Miyake et al., 2000).
Use in the cognitive treatment pathway
Mental rigidity and difficulty changing strategy appear after frontal-lobe injury, stroke and in ageing. Therapy starts with overt rules (colour) and progresses to subtler rules and then to silent rule reversals; the "shift cost" — the drop in speed/accuracy after a rule change — is the key progress metric.
VR & digital evidence
A systematic review of VR-based executive-function tools supports the validity and acceptability of such measures (Borgnis et al., 2022), and gamified WCST versions show convergent validity with the classic test (Hommel et al., 2022).
This exercise is a rehabilitation aid, not a substitute for clinical assessment or therapy; program selection and interpretation of results remain with the care team.
References
- Grant DA, Berg EA. A behavioral analysis of degree of reinforcement and ease of shifting to new responses in a Weigl-type card-sorting problem. Journal of Experimental Psychology. 1948;38(4):404–411. doi:10.1037/h0059831
- Heaton RK, Chelune GJ, Talley JL, Kay GG, Curtiss G. Wisconsin Card Sorting Test Manual: Revised and Expanded. Psychological Assessment Resources; 1993.
- Miyake A, Friedman NP, Emerson MJ, Witzki AH, Howerter A, Wager TD. The unity and diversity of executive functions and their contributions to complex "frontal lobe" tasks. Cognitive Psychology. 2000;41(1):49–100. doi:10.1006/cogp.1999.0734
- Borgnis F, Baglio F, Pedroli E, et al. Available virtual reality-based tools for executive functions: a systematic review. Frontiers in Psychology. 2022;13:833136. doi:10.3389/fpsyg.2022.833136
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