The determination task measures reactive stress tolerance: how fast and accurately you respond to a rapid, self-paced stream of cues, each mapped to its own response. Hit the matching colour as quickly as you can. From Medium a genuine second sensory channel joins the stream: a tone that you answer with the Space bar, the way the full-scale version mixes sounds in among the colours. Hard keeps the tones and tightens the response window.
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This measures reactive stress tolerance and response speed under a fast, relentless stream of signals. It is less about peak speed and more about holding your performance together when the pace is uncomfortable.
Before your first scored run, confirm which key or button maps to each colour so each response feels automatic rather than deliberate. Under continuous time pressure, pressing before the match is confirmed is the main source of errors. An accurate response triggers the next cue immediately; an error disrupts your rhythm and costs score.
The score blends accuracy, throughput and speed together, so a fast wrong answer costs more than a careful correct one. The task is designed to measure how well you maintain correct responses when the cues never pause, which is exactly the reactive stress tolerance that multi-stimulus reaction batteries assess. Sustained accuracy at a steady pace will outscore bursts of speed followed by errors.
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