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Imagined Self-Motion Differs from Perceived Self-Motion: Evidence from a Novel Continuous Pointing Method
| Content Provider | CiteSeerX |
|---|---|
| Author | Jennifer L. Campos¤a. Joshua H. Siegle¤b. Mohler, Betty J. Bülthoff, Heinrich H. Loomis, Jack M. |
| Abstract | Background: The extent to which actual movements and imagined movements maintain a shared internal representation has been a matter of much scientific debate. Of the studies examining such questions, few have directly compared actual full-body movements to imagined movements through space. Here we used a novel continuous pointing method to a) provide a more detailed characterization of self-motion perception during actual walking and b) compare the pattern of responding during actual walking to that which occurs during imagined walking. Methodology/Principal Findings: This continuous pointing method requires participants to view a target and continuously point towards it as they walk, or imagine walking past it along a straight, forward trajectory. By measuring changes in the pointing direction of the arm, we were able to determine participants ’ perceived/imagined location at each moment during the trajectory and, hence, perceived/imagined self-velocity during the entire movement. The specific pattern of pointing behaviour that was revealed during sighted walking was also observed during blind walking. Specifically, a peak in arm azimuth velocity was observed upon target passage and a strong correlation was observed between arm azimuth velocity and pointing elevation. Importantly, this characteristic pattern of pointing was not consistently observed during imagined self-motion. Conclusions/Significance: Overall, the spatial updating processes that occur during actual self-motion were not evidenced |
| File Format | |
| Access Restriction | Open |
| Content Type | Text |
