dual-task

dual-task is a cognitive psychology paradigm in which subjects perform two or more tasks simultaneously, and the resulting performance decrement relative to single-task performance is quantified as the dual-task cost. The paradigm operates under the constraint that tasks draw on limited cognitive resources—whether a shared central processor (as in central-executive models) or modality-specific buffers (as in working-memory models)—and the cost reveals the degree of resource overlap. Parameters: (1) two tasks each independently performable, (2) simultaneous or near-simultaneous presentation, (3) measurable output on each task (reaction time, accuracy, or both), (4) a single-task baseline for comparison. The concept persists through experimental protocols published in peer-reviewed literature, cognitive assessment batteries, and training methodologies that use dual-task interference to probe attentional and executive capacity. [formal: dual task | substrate: mind | horizon: hours | explicit: yes | epoch: 0.12]