Head direction (HD) cells respond to the animal's HD in the horizontal plane ( Ranck, 1985 Taube et al., 1990a, b). Further work is suggested on the basis of our findings, which represent a valuable contribution to understanding of the head direction cell system. ![]() Increased neuronal rise time is found to slow path integration, and the slowing effect for a given rise time is found to be more severe in the context of short conduction delays. ![]() On the basis of the latter, the important prediction is made that head direction cell regions directly involved in path integration will not contain this type of connectivity giving a theoretical explanation for architectural observations. Specifically, two major limiting factors are identified: rise time, the time after stimulation it takes for a neuron to start firing, and the presence of symmetric non-offset within-layer recurrent collateral connectivity. They are able to track head direction using only internally-derived information (path integration)In this simulation study we investigate the factors that affect path integration accuracy. Head direction cells fire to signal the direction in which an animal's head is pointing. Departmental of Experimental Psychology, Oxford Center for Theoretical Neuroscience and Artificial Intelligence, University of Oxford, Oxford, UK.
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