A lifespan study on body schema and perceived reaching distance

Area of Science:

• Neuroscience
• Cognitive Psychology
• Human Lifespan Development

Background:

• Tool use can integrate into the body representation, acting as extensions of the body.
• This incorporation is age-dependent, influenced by developing and declining sensorimotor integration.
• Understanding age-related plasticity in body schema is crucial for human-computer interaction and rehabilitation.

Purpose of the Study:

• To investigate how age affects body schema plasticity and perceived reaching distance after short-term tool-use training.
• To examine the influence of near and far space manipulation on these adaptations.
• To determine if tool-use training induces significant changes in tactile distance perception and reaching estimations across the lifespan.

Main Methods:

• Eighty-four participants (ages 12-80) underwent a tool-use paradigm in near and far space.
• Tactile distance judgment on the forearm assessed body schema changes.
• Reaching distance estimation tasks were performed before and after training.

Main Results:

• Participants showed reduced tactile distance estimation on the forearm, but tool-use training did not alter these judgments.
• No significant changes in perceived reaching distance were observed after tool-use training in either near or far space.
• These effects were consistent across all tested age groups.

Conclusions:

• Short-term tool-use training does not significantly alter tactile distance perception or perceived reaching distance across age groups.
• Brief tool-use exposure appears insufficient for inducing lasting sensorimotor adaptations.
• The fundamental integration of tools into body representation may remain stable throughout the lifespan, despite age-related differences in proficiency.