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| Content Provider | Springer Nature Link |
|---|---|
| Author | Chrastil, Elizabeth R. Warren, William H. |
| Copyright Year | 2017 |
| Abstract | Path integration is fundamental to human navigation. When a navigator leaves home on a complex outbound path, they are able to keep track of their approximate position and orientation and return to their starting location on a direct homebound path. However, there are several sources of error during path integration. Previous research has focused almost exclusively on encoding error—the error in registering the outbound path in memory. Here, we also consider execution error—the error in the response, such as turning and walking a homebound trajectory. In two experiments conducted in ambulatory virtual environments, we examined the contribution of execution error to the rotational component of path integration using angle reproduction tasks. In the reproduction tasks, participants rotated once and then rotated again to face the original direction, either reproducing the initial turn or turning through the supplementary angle. One outstanding difficulty in disentangling encoding and execution error during a typical angle reproduction task is that as the encoding angle increases, so does the required response angle. In Experiment 1, we dissociated these two variables by asking participants to report each encoding angle using two different responses: by turning to walk on a path parallel to the initial facing direction in the same (reproduction) or opposite (supplementary angle) direction. In Experiment 2, participants reported the encoding angle by turning both rightward and leftward onto a path parallel to the initial facing direction, over a larger range of angles. The results suggest that execution error, not encoding error, is the predominant source of error in angular path integration. These findings also imply that the path integrator uses an intrinsic (action-scaled) rather than an extrinsic (objective) metric. |
| Starting Page | 1885 |
| Ending Page | 1897 |
| Page Count | 13 |
| File Format | |
| ISSN | 00144819 |
| Journal | Experimental Brain Research |
| Volume Number | 235 |
| Issue Number | 6 |
| e-ISSN | 14321106 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2017-03-16 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Navigation Idiothetic Self-motion Intrinsic metric Perception–action Virtual reality Neurosciences Neurology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Neuroscience |
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