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Temporal Frequency of Whisker Movement. I. Representations in Brain Stem and Thalamus
 

Summary: Temporal Frequency of Whisker Movement. I. Representations
in Brain Stem and Thalamus
RONEN SOSNIK, SEBASTIAN HAIDARLIU, AND EHUD AHISSAR
Department of Neurobiology, The Weizmann Institute of Science, Rehovot 76100, Israel
Received 13 October 2000; accepted in final form 9 February 2001
Sosnik, Ronen, Sebastian Haidarliu, and Ehud Ahissar. Temporal
frequency of whisker movement. I. Representations in brain stem and
thalamus. J Neurophysiol 86: 339353, 2001. How does processing of
information change the internal representations used in subsequent
stages of sensory pathways? To approach this question, we studied the
representations of whisker movements in the lemniscal and
paralemniscal pathways of the rat vibrissal system. We recently sug-
gested that these two pathways encode movement frequency in dif-
ferent ways. We proposed that paralemniscal thalamocortical circuits,
functioning as phase-locked loops (PLLs), translate temporally coded
information into a rate code. Here we focus on the two major trigem-
inal nuclei of the brain stem, nucleus principalis and subnucleus
interpolaris, and on their thalamic targets, the ventral posteromedial
nucleus (VPM) and the medial division of the posterior nucleus
(POm). This is the first study in which these brain stem and thalamic

  

Source: Ahissar, Ehud - Department of Neurobiology, Weizmann Institute of Science

 

Collections: Biology and Medicine