Navigation and location can occur without external cues

Navigation and location can occur without external cues
An illustration of a rat using a distributed estimate to determine its location using a memory map but no external cue. Credit: Rat images were obtained from a video taken by Chris Nolan (Queensland Brain Institute). The composite image was generated by Allen Cheung.

Researchers from The University of Queensland have identified the amount of information the brain needs in order to navigate and accurately estimate location.

Research published this week in PLOS Computational Biology determines that animal brains can, in principle, use a memory map to estimate location without – such as sight, smell, touch and sound.

Dr Allen Cheung of the Queensland Brain Institute said that people had previously incorrectly assumed that external input was needed to work out where you are in an environment. However, even when starting at a point of complete disorientation the can use a previously-learned map to accurately estimate location by self-motion cues, such as walking.

The study shows that knowledge of the boundary of an arena, without requiring direct physical contact, is enough to locate one's position. Optimal localization performance was found to depend on arena shape, arena size, local and global rotational asymmetry, and the structure of the path taken during localization.

The authors commented: "There are a lot of possibilities that arise from this research, but the parts of the brain believed to carry out these computations, as found by the recent Nobel Laureates in Physiology or Medicine, are significantly affected by such as Alzheimer's."


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More information: Cheung A (2014) Estimating Location without External Cues. PLoS Comput Biol 10(10): e1003927. DOI: 10.1371/journal.pcbi.1003927
Journal information: PLoS Computational Biology

Citation: Navigation and location can occur without external cues (2014, October 30) retrieved 20 February 2020 from https://medicalxpress.com/news/2014-10-external-cues.html
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