Idiosyncratic Gesture

A body-based communicative movement whose form and meaning are specific to one individual (and often to one communication partner), rather than drawn from a shared vocabulary like American Sign Language. Idiosyncratic gestures are central to unaided AAC for many people with motor or speech impairments: a shoulder shrug for "I don't know," a head tilt for "over there," a wrist flick for "forget it." Because they are not standardised, they fall outside the assumptions of mainstream gesture-recognition systems trained on able-bodied datasets with consistent, repeatable trajectories. Designing recognisers for idiosyncratic gestures requires per-user personalisation, few-shot learning, and attention to motor profiles (spasticity, tremor, limited range of motion, fluctuating tone) that mainstream activity-recognition research does not address.