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Monica Biggio1, Ambra Bisio2, Piero Ruggeri2

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Boxing training alters defensive responses. Athletes show reduced Hand Blink Reflex (HBR) amplitude near the face, suggesting learned postures modify sensorimotor defensive peripersonal space (DPPS).

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Defensive Behavior

Background:

  • The Hand Blink Reflex (HBR) is a protective subcortical response.
  • HBR amplitude increases when a stimulated hand enters the defensive peripersonal space (DPPS) near the face.
  • Protective barriers like screens can reduce HBR, but learned motor skills' impact is less understood.

Purpose of the Study:

  • To investigate if learning a protective head-guarding posture modulates HBR responses.
  • To explore how sensorimotor experience from learned defensive postures influences the DPPS.

Main Methods:

  • Recruited two groups: 13 boxers and 13 non-boxers (controls).
  • Recorded and elicited HBR via median nerve stimulation in three hand positions relative to the face.
  • Compared HBR amplitude between groups and correlated it with boxing experience.

Main Results:

  • Boxers exhibited suppressed HBR enhancement in a static, face-proximal position, unlike controls.
  • Greater boxing experience correlated with stronger HBR suppression.
  • This suppression was absent when boxers moved their hands towards or away from the face.

Conclusions:

  • Learned sensorimotor skills, like boxing defensive postures, can modify the HBR.
  • This modification suggests that learned protective actions can reshape the perceived defensive peripersonal space (DPPS).