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Examining the Equivalence Between Imagery and Execution-Does Imagery Comprise the Intended Spatial Trajectory? | LitMetric

AI Article Synopsis

  • - The functional equivalence model posits that both mental imagery and physical execution of movements share a common internal representation, which is supported by the mental chronometry effect showing a connection between task difficulty and imagined movement time.
  • - A study was conducted where participants imagined and executed a rapid aiming movement while adapting auditory tones to assess their perceived limb position after the movements at early and late intervals.
  • - Results indicated that while there was a correlation between increased task difficulty and longer movement times, participants showed minimal difference in estimated limb positions based on the timing of the tones, suggesting limitations in spatial accuracy during mental imagery despite clear temporal equivalence.

Article Abstract

The functional equivalence model suggests a common internal representation initiates both imagery and execution. This suggestion is supported by the mental chronometry effect, where there is a positive relation between task difficulty (as defined by the Index of Difficulty; ID) and imagined movement time. The present study extends this logic by examining whether imagery captures the spatial trajectory. Participants were initially tasked with the imagery and execution of a rapid aiming movement under different IDs. These initial attempts were adapted to configure auditory tones at early (25%) and late (75%) intervals for a separate set of imagery trials. If a tone had sounded, participants had to estimate post-trial where their imagined limb would have been located. The findings revealed increases in ID that coincided with increases in imagined and executed movement times. However, participant mean and standard deviation of estimated locations revealed limited differences between the early and late tones. Further inspection revealed some evidence for these estimated locations shifting further along in space following more rapid imagined movements. While equivalence is clearly evident within the temporal domain, there is comparatively little to suggest that this logic extends to the resolution required for simulating the spatial characteristics of movement.

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Source
http://dx.doi.org/10.1080/00222895.2024.2406925DOI Listing

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