Balance affects prism adaptation: evidence from the latent aftereffect

Area of Science:

• Motor Control
• Perceptual Adaptation
• Human Movement Science

Background:

• Prism adaptation studies how the visual system adjusts to prismatic distortion.
• The magnitude of prism aftereffects depends on the consistency of conditions between training and testing phases.
• Understanding these aftereffects offers insights into implicit memory and learning processes.

Purpose of the Study:

• To investigate the influence of altered environmental conditions on prism adaptation during a throwing task.
• To examine how changes in the testing environment affect the primary and secondary aftereffects of prism adaptation.
• To explore the parallels between prism adaptation and implicit memory performance.

Main Methods:

• Participants performed underhand throwing tasks while wearing left-shifting prism glasses during a training phase.
• Training conditions varied across groups, involving standing on the floor or a balance board.
• Testing phases involved throwing without prisms, with conditions manipulated to match or differ from training.

Main Results:

• A smaller primary aftereffect was observed when the first test condition differed from training (Group 3).
• A larger secondary aftereffect was observed when training conditions were reinstated in the second test (Group 3).
• The total prism aftereffect sum remained consistent across all groups, regardless of condition changes.

Conclusions:

• The persistence and expression of prism adaptation are sensitive to the congruence of environmental conditions between training and testing.
• Environmental context plays a crucial role in the expression of motor adaptation, akin to context-dependent implicit memory.
• These findings highlight the adaptive nature of the sensorimotor system and its reliance on contextual cues.