Haptic object localization in the vibrissal system: behavior and performance.
Identifieur interne : 005B93 ( Main/Exploration ); précédent : 005B92; suivant : 005B94Haptic object localization in the vibrissal system: behavior and performance.
Auteurs : Per Magne Knutsen [Israël] ; Maciej Pietr ; Ehud AhissarSource :
- The Journal of neuroscience : the official journal of the Society for Neuroscience [ 1529-2401 ] ; 2006.
English descriptors
- KwdEn :
- MESH :
- physiology : Discrimination (Psychology), Discrimination Learning, Head Movements, Movement, Rats, Sensation, Vibrissae.
- psychology : Rats.
- Animals, Male, Rats, Wistar, Time Factors.
Abstract
Using their large mystacial vibrissas, rats perform a variety of tasks, including localization and identification of objects. We report on the discriminatory thresholds and behavior of rats trained in a horizontal object localization task. Using an adaptive training procedure, rats learned to discriminate offsets in horizontal (anteroposterior) location with all, one row, or one arc of whiskers intact, but not when only a single whisker (C2) was intact on each cheek. However, rats initially trained with multiple whiskers typically improved when retested later with a single whisker intact. Individual rats reached localization thresholds as low as 0.24 mm (approximately 1 degree). Among the tested groups, localization acuity was finest (<1.5 mm) with rats that were initially trained with all whiskers and then trimmed to one arc of whiskers intact. Horizontal acuity was finer than the typical inter-vibrissal spacing (approximately 4.8 mm at contact points). Performance correlated with the net whisking spectral power in the range of 5-25 Hz but not in nonwhisking range of 30-50 Hz. Lesioning the facial motor nerves reduced performance to chance level. We conclude that horizontal object localization in the rat vibrissal system can reach hyperacuity level and is an active sensing process: whisker movements are both required and beneficiary, in a graded manner, for making accurate positional judgments.
DOI: 10.1523/JNEUROSCI.1516-06.2006
PubMed: 16914670
Affiliations:
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Le document en format XML
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We report on the discriminatory thresholds and behavior of rats trained in a horizontal object localization task. Using an adaptive training procedure, rats learned to discriminate offsets in horizontal (anteroposterior) location with all, one row, or one arc of whiskers intact, but not when only a single whisker (C2) was intact on each cheek. However, rats initially trained with multiple whiskers typically improved when retested later with a single whisker intact. Individual rats reached localization thresholds as low as 0.24 mm (approximately 1 degree). Among the tested groups, localization acuity was finest (<1.5 mm) with rats that were initially trained with all whiskers and then trimmed to one arc of whiskers intact. Horizontal acuity was finer than the typical inter-vibrissal spacing (approximately 4.8 mm at contact points). Performance correlated with the net whisking spectral power in the range of 5-25 Hz but not in nonwhisking range of 30-50 Hz. Lesioning the facial motor nerves reduced performance to chance level. We conclude that horizontal object localization in the rat vibrissal system can reach hyperacuity level and is an active sensing process: whisker movements are both required and beneficiary, in a graded manner, for making accurate positional judgments.</div></front></TEI><affiliations><list><country><li>Israël</li></country></list><tree><noCountry><name sortKey="Ahissar, Ehud" sort="Ahissar, Ehud" uniqKey="Ahissar E" first="Ehud" last="Ahissar">Ehud Ahissar</name><name sortKey="Pietr, Maciej" sort="Pietr, Maciej" uniqKey="Pietr M" first="Maciej" last="Pietr">Maciej Pietr</name></noCountry><country name="Israël"><noRegion><name sortKey="Knutsen, Per Magne" sort="Knutsen, Per Magne" uniqKey="Knutsen P" first="Per Magne" last="Knutsen">Per Magne Knutsen</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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