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Spatiotemporal Patterns of Contact Across the Rat Vibrissal Array During Exploratory Behavior
Jennifer A Hobbs1, R Blythe Towal2, Mitra J Z Hartmann3
1Department of Physics and Astronomy, Northwestern University Evanston, IL, USA.
Frontiers in Behavioral Neuroscience
|January 19, 2016
Summary
Rats use their whiskers to explore surfaces, making brief, collective contacts. This "windowed sampling" strategy allows them to integrate touch information for spatial perception.
Area of Science:
- Neuroscience
- Somatosensation
- Animal Behavior
Background:
- The rat vibrissal system is crucial for somatosensation.
- Previous studies faced limitations in precisely measuring whisker-object contact sequences due to whisker size and speed.
Purpose of the Study:
- To precisely quantify the spatiotemporal structure of whisker-surface contact sequences during free exploration.
- To investigate the role of whisker contact patterns in spatial feature extraction.
Main Methods:
- Utilized a laser light sheet for 1 ms resolution quantification of whisker-surface contact.
- Observed five naïve rats freely exploring a vertical glass wall.
Main Results:
- Identified quasi-periodic (~8 Hz) head velocity variations as a temporal anchor for analysis.
- Discovered "sustained collective contact intervals" (SCCIs) where multiple whiskers contact the surface.
- Contact sequences were highly variable, but contact locations converged and slowed during SCCIs.
Conclusions:
- Proposed a "windowed sampling" strategy where rats integrate mechanical signals during SCCIs.
- Suggests rats use an "enclosing" haptic procedure for spatial feature extraction.
- Highlights the importance of sustained collective contact for tactile perception.
