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Priority rules govern the organization of traffic on foraging trails under crowding conditions in the leaf-cutting ant Atta colombica.
J Exp Biol
February 2009
Centre de Recherches sur la Cognition animale, UMR CNRS 5169, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France.
Foraging in leaf-cutting ants is generally organized along well-defined recruitment trails supporting a bi-directional flow of outbound and nestbound individuals. This study attempts to reveal the priority rules governing the organization of traffic on these trails. Ants were forced to move on a narrow trail, allowing the passage of only two individuals at a time.
View Article and Find Full Text PDFLight induces c-fos and per1 expression in the suprachiasmatic nucleus of arrhythmic hamsters.
Am J Physiol Regul Integr Comp Physiol
November 2005
Department of Biological Sciences, 371 Serra Mall, Stanford University, Stanford, California 94305-5020, USA.
Locomotor activity rhythms in a significant proportion of Siberian hamsters (Phodopus sungorus sungorus) become arrhythmic after the light-dark (LD) cycle is phase-delayed by 5 h. Arrhythmia is apparent within a few days and persists indefinitely despite the presence of the photocycle. The failure of arrhythmic hamsters to regain rhythms while housed in the LD cycle, as well as the lack of any masking of activity, suggested that the circadian system of these animals had become insensitive to light.
View Article and Find Full Text PDFInteraction of neuronal populations with delay: effect of frequency mismatch and feedback gain.
Int J Neural Syst
March 1995
Division of Neurobiology, University of California, Berkeley 94720, USA.
The effect of frequency mismatch, signal transduction delay and inter-population feedback gain on the interaction of neuronal populations, mediated by long-range excitation, is investigated using physiologically realistic system parameters. Self-consistent solutions for the frequency, amplitude, and relative phase of the component signals are derived for limit cycle oscillations. These solutions predict important qualitative features including discontinuous changes in frequency of oscillation and phase reversal between symmetric and antisymmetric limit cycles.
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