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. Author manuscript; available in PMC: 2010 Jan 29.
Published in final edited form as: Neuron. 2009 Jan 29;61(2):187–202. doi: 10.1016/j.neuron.2008.11.026

Figure 1. Overview of neural network model.

Figure 1

(A) Simplified block diagram of network architecture. (B) Sketch of newborn granule cell (GC) maturation process implemented in model. (C) Growth of the GC layer and cell death. (D) Timeline of model growth initialization and growth. (E) Sample input neuron activity in different environments (Env). Medial entorhinal cortex (mEC) neurons (top) have spatial response, lateral EC (lEC) neurons (bottom) fire at equal rates at all spatial locations. (F) Illustration of how the network is trained and tested. During training (top), model “explores” random paths within an environment. During testing (bottom), network activity is measured in a series of spatial locations that tile the environment