Journal
JOURNAL OF NEUROSCIENCE
Volume 34, Issue 16, Pages 5431-5446Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.0511-14.2014
Keywords
spatial orientation; landmark navigation; posterior parietal cortex; head direction; spatial navigation; allocentric
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Funding
- Alberta Innovates Health Solutions Polaris Award [MH46823-16]
- Alberta Innovates Health Solutions Fellowships
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Navigation requires coordination of egocentric and allocentric spatial reference frames and may involve vectorial computations relative to landmarks. Creation of a representation of target heading relative to landmarks could be accomplished from neurons that encode the conjunction of egocentric landmark bearings with allocentric head direction. Landmark vector representations could then be created by combining these cells with distance encoding cells. Landmark vector cells have been identified in rodent hippocampus. Given remembered vectors at goal locations, it would be possible to use such cells to compute trajectories to hidden goals. To look for the first stage in this process, we assessed parietal cortical neural activity as a function of egocentric cue light location and allocentric head direction in rats running a random sequence to light locations around a circular platform. We identified cells that exhibit the predicted egocentric-by-allocentric conjunctive characteristics and anticipate orienting toward the goal.
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