Angular path integration by moving "hill of activity": A spiking neuron model without recurrent excitation of the head-direction system

Pengcheng Song, Xiao Jing Wang

Research output: Contribution to journalArticlepeer-review

Abstract

During spatial navigation, the head orientation of an animal is encoded internally by neural persistent activity in the head-direction (HD) system. In computational models, such a bell-shaped "hill of activity" is commonly assumed to be generated by recurrent excitation in a continuous attractor network. Recent experimental evidence, however, indicates that HD signal in rodents originates in a reciprocal loop between the lateral mammillary nucleus (LMN) and the dorsal tegmental nucleus (DTN), which is characterized by a paucity of local excitatory axonal collaterals. Moreover, when the animal turns its head to a new direction, the heading information is updated by a time integration of angular head velocity (AHV) signals; the underlying mechanism remains unresolved. To investigate these issues, we built and investigated an LMN-DTN network model that consists of three populations of noisy and spiking neurons coupled by biophysically realistic synapses. We found that a combination of uniform external excitation and recurrent cross-inhibition can give rise to direction-selective persistent activity. The model reproduces the experimentally observed three types of HD tuning curves differentially modulated by AHV and anticipatory firing activity in LMN HD cells. Time integration is assessed by using constant or sinusoidal angular velocity stimuli, as well as naturalistic AHV inputs (from rodent recordings). Furthermore, the internal representation of head direction is shown to be calibrated or reset by strong external cues. We identify microcircuit properties that determine the ability of our model network to subserve time integration function.

Original languageEnglish (US)
Pages (from-to)1002-1014
Number of pages13
JournalJournal of Neuroscience
Volume25
Issue number4
DOIs
StatePublished - Feb 26 2005

Keywords

  • Computational modeling
  • Head direction
  • Lateral inhibition
  • Navigation
  • Path integration
  • Persistent activity

ASJC Scopus subject areas

  • Neuroscience(all)

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