Document Type
Article
Abstract
Dead reckoning is an on-line form of spatial navigation used by an animal to identify its present location and return directly to a starting location, even after circuitous outward trips. At present, it is not known which of several self-movement cues (efferent copy from movement commands, proprioceptive information, sensory flow, or vestibular information) are used to compute homeward trajectories. To determine whether vestibular information is important for dead reckoning, the impact of chemical labyrinthectomy was evaluated in a test that demanded on-line computation of a homeward trajectory. Rats were habituated to leave a refuge that was visible from all locations on a circular table to forage for large food pellets, which they carried back to the refuge to eat. Two different probe trials were given: (1) the rats foraged from the same spatial location from a hidden refuge in the light and so were able to use visual cues to navigate; (2) the same procedure took place in the dark, constraining the animals to dead reckon. Although control rats carried food directly and rapidly back to the refuge on both probes, the rats with vestibular lesions were able to do so on the hidden refuge but not on the dark probe. The scores of vestibular reflex tests predicted the dead reckoning deficit. The vestibular animals were also impaired in learning a new piloting task. This is the first unambiguous demonstration that vestibular information is used in dead reckoning and also contributes to piloting.
Publication Date
11-1-2002
Recommended Citation
Wallace, D.G., Hines, D.J., Pellis, S., & Whishaw, I.Q. (2002). Vestibular information is required for dead reckoning in the rat. Journal of Neuroscience, 22 (22), 10009-17.
Original Citation
Wallace, D.G., Hines, D.J., Pellis, S., & Whishaw, I.Q. (2002). Vestibular information is required for dead reckoning in the rat. Journal of Neuroscience, 22 (22), 10009-17.
Legacy Department
Department of Psychology
Sponsorship
This research was supported by grants from the Canadian Institute of Health Research.
ISSN
0270-6474
Language
eng
Publisher
Society for Neuroscience
