Juggling reveals a decisional component to tactile suppression.

Area of Science:

• Neuroscience
• Motor Control
• Sensory Perception

Background:

• Goal-directed movements often involve sensory suppression, a reduced sensitivity to stimuli.
• Tactile sensory suppression is a known phenomenon, but its mechanisms during complex motor tasks require further investigation.

Purpose of the Study:

• To investigate tactile sensory suppression during a complex motor task (juggling).
• To determine if tactile sensitivity and response bias change during juggling.
• To explore the potential role of decisional processes in tactile suppression.

Main Methods:

• Participants performed a tactile gap detection task on their wrist while at rest and while juggling.
• An auditory gap detection task was also conducted under similar conditions.
• Control experiments examined auditory and tactile gap detection at rest, including conditions of tactile interference.

Main Results:

• Participants showed significantly reduced sensitivity to tactile gaps while juggling compared to rest.
• A significant shift towards a more conservative response criterion was observed during juggling.
• These findings suggest a decisional component contributing to tactile suppression during movement.

Conclusions:

• Movement-related tactile sensory suppression is demonstrated during complex motor tasks.
• Tactile suppression during movement involves a decisional component, potentially initiated before the motor command.
• This suggests anticipatory sensory gating mechanisms in the brain during action planning.