Crossmodal congruency effect scores decrease with repeat test exposure.

Area of Science:

• Neuroscience
• Psychophysics
• Cognitive Science

Background:

• The body schema, representing the sense of one's own body, can incorporate external feedback.
• The crossmodal congruency task (CCT) objectively quantifies body schema incorporation using visual-tactile interference.
• The crossmodal congruency effect (CCE) score, derived from CCT, measures response time differences between congruent and incongruent trials.

Purpose of the Study:

• To investigate the impact of repeated exposure on CCE scores.
• To identify potential learning effects influencing CCE measurements.
• To propose and evaluate strategies for mitigating learning effects in CCT assessments.

Main Methods:

• Participants underwent repeated sessions of the visual-tactile CCT.
• CCE scores were calculated as the difference in reaction times between incongruent and congruent trials.
• A modified, shortened CCT protocol was developed and compared to the original protocol.

Main Results:

• Repeated CCT exposure led to a significant attenuation of CCE scores, indicating a learning effect.
• This learning effect persisted even after a 6-month break from testing.
• The modified CCT protocol effectively reduced the impact of the learning effect on CCE scores without increasing score variability.

Conclusions:

• The CCE score is susceptible to learning effects from prolonged or repeated CCT exposure.
• A persistent learning effect necessitates consideration of task exposure duration in experimental design.
• A modified, shortened CCT protocol offers a viable solution to mitigate learning effects, enhancing the utility of this psychophysical assessment in various settings.