Visuotactile Temporal Recalibration Transfers Across Different Locations

Area of Science:

• Neuroscience
• Perception
• Human Motor Control

Background:

• Prolonged exposure to audiovisual asynchrony shifts an observer's point of subjective simultaneity (PSS) towards the leading sensory modality.
• It remains debated whether similar temporal recalibration occurs with other sensory pairings, like vision and touch, and if the underlying timing mechanism is centralized or distributed.

Purpose of the Study:

• To investigate temporal recalibration in visuotactile adaptation.
• To determine if recalibration effects transfer to the non-adapted side.
• To explore whether the internal timing mechanism for visuotactile adaptation is centralized or distributed.

Main Methods:

• Observers were adapted to vision-leading and tactile-leading visuotactile asynchrony on either their left or right hand.
• Simultaneity judgments were performed on the adapted (unilateral) and non-adapted (contralateral) sides.
• A bilateral opposed condition involved concurrent adaptation to equal and opposite asynchronies on each hand.

Main Results:

• Observers recalibrated to visuotactile asynchronies, with effects transferring to the non-adapted side, suggesting a centralized mechanism.
• When adapted to opposing asynchronies on each hand, one group showed no recalibration, supporting a centralized model.
• However, another group with opposing asynchronies showed recalibration, indicating a distributed mechanism.

Conclusions:

• Visuotactile temporal recalibration occurs and can transfer across sides, supporting a centralized timing mechanism.
• Evidence suggests the existence of both centralized and distributed timing mechanisms, proposing a hybrid model for sensory adaptation.