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08:38
Testing of all Six Semicircular Canals with Video Head Impulse Test Systems
Published on: April 18, 2019
A real head turner: horizontal and vertical head directions are multichannel coded
Rebecca P Lawson1, Colin W G Clifford, Andrew J Calder
1MRC Cognition and Brain Sciences Unit, Cambridge, UK. rebecca.lawson@ucl.ac.uk
Journal of Vision
|August 30, 2011
Summary
Human head direction perception uses a multichannel system, not opponent coding. This system features distinct cell pools tuned to various head views, supporting visual coding in both horizontal and vertical planes.
Area of Science:
- Neuroscience
- Visual Perception
- Human Brain Imaging
Background:
- Head direction is a key social cue indicating attention.
- Macaque studies reveal head-selective cells in the superior temporal sulcus.
- Human visual representation of head direction across planes remains under-investigated.
Purpose of the Study:
- To investigate the coding mechanisms of human head direction perception.
- To differentiate between multichannel and opponent-coding models for head direction.
- To examine head direction representation in both horizontal and vertical planes.
Main Methods:
- Employed adaptation procedures to probe neural coding.
- Designed experiments to yield distinct predictions for multichannel vs. opponent coding.
- Conducted four experiments to systematically test coding hypotheses.
Main Results:
- Experimental results supported multichannel coding.
- Evidence for multichannel coding was found for both vertical and horizontal head direction axes.
- Opponent-coding model was not supported by the data.
Conclusions:
- Human head direction coding is best explained by a multichannel system.
- Distinct neural channels are tuned to specific head views (e.g., left, right, up, down).
- This multichannel system effectively represents head orientation in multiple planes.
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