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Visual cortical prosthesis with a geomagnetic compass restores spatial navigation in blind rats
Hiroaki Norimoto1, Yuji Ikegaya2
1Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
Current Biology : CB
|April 7, 2015
Summary
Blind rats can navigate mazes effectively when given real-time head direction feedback. This demonstrates that external cues can compensate for deficits in absolute direction perception, aiding spatial exploration.
Area of Science:
- Neuroscience
- Spatial Navigation
- Sensory Compensation
Background:
- Allocentric sense is crucial for spatial navigation.
- Impaired absolute direction perception contributes to spatial exploration difficulties in blind individuals.
- Understanding compensatory mechanisms is vital for aiding spatial cognition.
Purpose of the Study:
- To investigate if externally provided head direction feedback can enable blind rats to perform spatial navigation tasks.
- To assess the efficacy of geomagnetic information as a substitute for intrinsic directional cues.
- To compare navigation strategies and performance between blind and sighted rats.
Main Methods:
- Adult rats had their eyelids sutured to induce blindness.
- Head-mountable microstimulators and a digital geomagnetic compass were implanted in the primary visual cortex.
- Blind rats were trained to navigate T-shaped and complex mazes using real-time geomagnetic feedback.
Main Results:
- Blind rats successfully learned to use geomagnetic information to solve mazes within tens of trials.
- Their performance levels and navigation strategies were comparable to those of normal sighted rats.
- The findings indicate successful compensation for the lack of intrinsic directional cues.
Conclusions:
- Blind rats can achieve normal spatial navigation performance with externally provided head direction cues.
- This study supports the notion that deficits in absolute direction perception can be overcome by extrinsic sensory input.
- Blind rats can recognize self-location using artificially supplied stereotactic cues, highlighting neural plasticity and compensatory potential.
