In the real Halstead-Reitan battery, total errors across ~200+ items feed into the Halstead Impairment Index. This demo isolates the core mechanic — learning a hidden rule from bell/buzzer feedback alone — it is not a validated or diagnostic measure.
What's faithful vs. simplified: the chime-for-correct / buzzer-for-incorrect feedback, the four-lever response format, one consistent principle per round, and a final "recall" round that recombines earlier principles are all accurate to the real Halstead Category Test's design. What's simplified: the real test uses 208 abstract geometric-figure slides across 7 subtests (not digits/dot-clusters), and gives no color cue — the patient must infer the principle from the picture's structure alone. Worth saying to students once.
Real motor pathways are largely crossed and lateralized — the dominant hemisphere typically drives faster, more controlled tapping in the dominant hand. On the real (mechanical) finger-tapping apparatus, the dominant hand is typically about 10% faster, and clinicians treat a 10–20% gap — or a reversal, where the non-dominant hand wins — as a meaningful lateralizing sign (exact cutoffs vary by study). A mouse or trackpad click isn't the same motor task as tapping a physical key, so this demo's numbers won't match those norms directly — treat the comparison below as illustrative of the logic, not a measurement (see Unit-II: Lateralization) — never a standalone diagnosis.