The Spatial Leaky Competing Accumulator Model

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Title: The Spatial Leaky Competing Accumulator Model
Authors: Zemliak, Viktoria
MacInnes, W. Joseph
Abstract: The Leaky Competing Accumulator model (LCA) of Usher and McClelland is able to simulate the time course of perceptual decision making between an arbitrary number of stimuli. Reaction times, such as saccadic latencies, produce a typical distribution that is skewed toward longer latencies and accumulator models have shown excellent fit to these distributions. We propose a new implementation called the Spatial Leaky Competing Accumulator (SLCA), which can be used to predict the timing of subsequent fixation durations during a visual task. SLCA uses a pre-existing saliency map as input and represents accumulation neurons as a two-dimensional grid to generate predictions in visual space. The SLCA builds on several biologically motivated parameters: leakage, recurrent self-excitation, randomness and non-linearity, and we also test two implementations of lateral inhibition. A global lateral inhibition, as implemented in the original model of Usher and McClelland, is applied to all competing neurons, while a local implementation allows only inhibition of immediate neighbors. We trained and compared versions of the SLCA with both global and local lateral inhibition with use of a genetic algorithm, and compared their performance in simulating human fixation latency distribution in a foraging task. Although both implementations were able to produce a positively skewed latency distribution, only the local SLCA was able to match the human data distribution from the foraging task. Our model is discussed for its potential in models of salience and priority, and its benefits as compared to other models like the Leaky integrate and fire network.
Citations: Zemliak, V. and MacInnes, W. J. (2022): The Spatial Leaky Competing Accumulator Model. Front. Comput. Sci. 4:866029
Subject Keywords: information accumulation; fixations latency distribution; visual search; reaction time; saliency map; lateral inhibition
Issue Date: 9-May-2022
License name: Attribution 4.0 International
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Type of publication: Einzelbeitrag in einer wissenschaftlichen Zeitschrift [Article]
Appears in Collections:FB08 - Hochschulschriften

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