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J Physiol Paris. 2014 Feb;108(1):28-37. doi: 10.1016/j.jphysparis.2013.07.002. Epub 2013 Jul 26.

A biologically inspired hierarchical goal directed navigation model.

Author information

1
Center for Memory and Brain and Graduate Program for Neuroscience, Boston University, 2 Cummington Mall, Boston, MA 02215, USA. Electronic address: merdem@bu.edu.
2
Center for Memory and Brain and Graduate Program for Neuroscience, Boston University, 2 Cummington Mall, Boston, MA 02215, USA. Electronic address: hasselmo@bu.edu.

Abstract

We propose an extended version of our previous goal directed navigation model based on forward planning of trajectories in a network of head direction cells, persistent spiking cells, grid cells, and place cells. In our original work the animat incrementally creates a place cell map by random exploration of a novel environment. After the exploration phase, the animat decides on its next movement direction towards a goal by probing linear look-ahead trajectories in several candidate directions while stationary and picking the one activating place cells representing the goal location. In this work we present several improvements over our previous model. We improve the range of linear look-ahead probes significantly by imposing a hierarchical structure on the place cell map consistent with the experimental findings of differences in the firing field size and spacing of grid cells recorded at different positions along the dorsal to ventral axis of entorhinal cortex. The new model represents the environment at different scales by populations of simulated hippocampal place cells with different firing field sizes. Among other advantages this model allows simultaneous constant duration linear look-ahead probes at different scales while significantly extending each probe range. The extension of the linear look-ahead probe range while keeping its duration constant also limits the degrading effects of noise accumulation in the network. We show the extended model's performance using an animat in a large open field environment.

KEYWORDS:

Entorhinal cortex; Grid cell; Hippocampus; Navigation; Place cell

PMID:
23891644
PMCID:
PMC3949664
DOI:
10.1016/j.jphysparis.2013.07.002
[Indexed for MEDLINE]
Free PMC Article

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