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Updated: Jan 18, 2026

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Sensing with tools extends somatosensory processing beyond the body.

Luke E Miller1,2,3, Luca Montroni4,5, Eric Koun4,5

  • 1Integrative Multisensory Perception Action & Cognition Team-ImpAct, Lyon Neuroscience Research Center, INSERM U1028, CNRS U5292, Lyon, France. luke.miller@inserm.fr.

Nature
|September 14, 2018
PubMed
Summary
This summary is machine-generated.

Humans can sense object contact location using tools, treating them as extensions of the body. This sensory extension integrates mechanical tool responses with neural processing for accurate tactile perception.

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Area of Science:

  • Neuroscience
  • Human Sensory Perception
  • Tool Use

Background:

  • Animals extend sensory processing beyond the nervous system (e.g., rodent whiskers, spider webs).
  • Human interaction with tools is typically viewed as simple mechanical manipulation.
  • The nervous system's role in processing tool-mediated sensory information is not fully understood.

Purpose of the Study:

  • To investigate if humans treat tools as sensory extensions of the body.
  • To explore the mechanisms of tactile information processing during tool use.
  • To determine if tools enable sensing beyond direct physical contact.

Main Methods:

  • Behavioral psychophysics experiments to assess tactile localization with tools.
  • Structural mechanics analysis of tool responses to impact.
  • Computational modeling of tactile afferents and neural encoding.

Main Results:

  • Human participants accurately sensed object contact location on a tool (wooden rod).
  • Tool impact location is encoded by the tool's modal response (pre-neuronal processing).
  • A computational model demonstrated rapid neural re-encoding of impact location, predicting human behavior.

Conclusions:

  • Tools are integrated by the nervous system as sensory extensions, not just passive links.
  • Tactile sensing with tools involves a functional coupling of material, biomechanical, and neural processing.
  • The study provides evidence for a pre-neuronal mechanical encoding of information in tools.