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Tag: Adaptive Control of Thought – Rational (ACT-R) Cognitive Architecture

A Computational Investigation of Sources of Variability in Sentence Comprehension Difficulty in Aphasia

Published in: Topics in Cognitive Science, Volume 10, Issue 1, 161-174 Abstract “We present a computational evaluation of three hypotheses about sources of deficit in sentence comprehension in aphasia: slowed processing, intermittent deficiency, and resource reduction. The ACT‐R based Lewis and Vasishth (2005) model is used to implement these three proposals. Slowed processing is implemented as slowed execution time of parse steps; intermittent deficiency as increased random noise in activation of elements in memory; and resource reduction as reduced spreading activation. As data, we considered subject vs. object relative sentences, presented in a self‐paced listening modality to 56 individuals with aphasia… Read More

Building an ACT‐R Reader for Eye‐Tracking Corpus Data

Published in: Topics in Cognitive Science, Volume 10, Issue 1, 144-160 Abstract “Cognitive architectures have often been applied to data from individual experiments. In this paper, I develop an ACT‐R reader that can model a much larger set of data, eye‐tracking corpus data. It is shown that the resulting model has a good fit to the data for the considered low‐level processes. Unlike previous related works (most prominently, Engelmann, Vasishth, Engbert & Kliegl, 2013 ), the model achieves the fit by estimating free parameters of ACT‐R using Bayesian estimation and Markov‐Chain Monte Carlo (MCMC) techniques, rather than by relying on the mix of… Read More

Computational cognitive modeling of the temporal dynamics of fatigue from sleep loss

Published in: Psychonomic Bulletin & Review, Volume 24, Issue 6, December 2017, 1785-1807 Abstract “Computational models have become common tools in psychology. They provide quantitative instantiations of theories that seek to explain the functioning of the human mind. In this paper, we focus on identifying deep theoretical similarities between two very different models. Both models are concerned with how fatigue from sleep loss impacts cognitive processing. The first is based on the diffusion model and posits that fatigue decreases the drift rate of the diffusion process. The second is based on the Adaptive Control of Thought – Rational (ACT-R) cognitive architecture… Read More