Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A computational investigation of sources of variability in sentence
  comprehension difficulty in aphasia   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 default production-rule firing time; intermittent
deficiency as increased random noise in activation of chunks in memory; and
resource reduction as reduced goal activation. As data, we considered subject
vs. object rela- tives whose matrix clause contained either an NP or a
reflexive, presented in a self-paced listening modality to 56 individuals with
aphasia (IWA) and 46 matched controls. The participants heard the sentences and
carried out a picture verification task to decide on an interpretation of the
sentence. These response accuracies are used to identify the best parameters
(for each participant) that correspond to the three hypotheses mentioned above.
We show that controls have more tightly clustered (less variable) parameter
values than IWA; specifically, compared to controls, among IWA there are more
individuals with low goal activations, high noise, and slow default action
times. This suggests that (i) individual patients show differential amounts of
deficit along the three dimensions of slowed processing, intermittent
deficient, and resource reduction, (ii) overall, there is evidence for all
three sources of deficit playing a role, and (iii) IWA have a more variable
range of parameter values than controls. In sum, this study contributes a proof
of concept of a quantitative implementation of, and evidence for, these three
accounts of comprehension deficits in aphasia.

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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org