Publications
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The myth of cognitive decline: Non‐linear dynamics of lifelong learning
Topics in cognitive science
As adults age, their performance on many psychometric tests changes systematically, a finding that is widely taken to reveal that cognitive information‐processing capacities decline across adulthood. Contrary to this, we suggest that older adults' changing performance reflects memory search demands, which escalate as experience grows. A series of simulations show how the performance patterns observed across adulthood emerge naturally in learning models as they acquire knowledge. The simulations…
As adults age, their performance on many psychometric tests changes systematically, a finding that is widely taken to reveal that cognitive information‐processing capacities decline across adulthood. Contrary to this, we suggest that older adults' changing performance reflects memory search demands, which escalate as experience grows. A series of simulations show how the performance patterns observed across adulthood emerge naturally in learning models as they acquire knowledge. The simulations correctly identify greater variation in the cognitive performance of older adults, and successfully predict that older adults will show greater sensitivity to fine‐grained differences in the properties of test stimuli than younger adults. Our results indicate that older adults' performance on cognitive tests reflects the predictable consequences of learning on information‐processing, and not cognitive decline.
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Formulaic sequences: Do they exist and do they matter?
Bejamins
There is a new and growing interest in psycholinguistics in the mental representation of (not necessarily phrasal) multi-word sequences and in how knowledge of these sequences relates to word, phrase, and sentence knowledge. In this paper we summarize the evidence for the existence of distinct mental representations for these types of sequences. Studies of sentence processing, contextual ambiguity resolution, speech production and compound word processing provide indirect evidence for frequency…
There is a new and growing interest in psycholinguistics in the mental representation of (not necessarily phrasal) multi-word sequences and in how knowledge of these sequences relates to word, phrase, and sentence knowledge. In this paper we summarize the evidence for the existence of distinct mental representations for these types of sequences. Studies of sentence processing, contextual ambiguity resolution, speech production and compound word processing provide indirect evidence for frequency effects for multi-word sequences. Recent studies of adult reading behavior have looked more directly at the effects of holistic frequency on reading performance. We end by considering the relevance of multi-word sequences to existing cognitive models of language and speculating on how they may impact on future models.
Other authors -
Exploring lexical co-occurrence space using HiDEx
Behavior Research Methods
Hyperspace analog to language (HAL) is a high-dimensional model of semantic space that uses the global co-occurrence frequency of words in a large corpus of text as the basis for a representation of semantic memory. In the original HAL model, many parameters were set without any a priori rationale. We have created and publicly released a computer application, the High Dimensional Explorer (HiDEx), that makes it possible to systematically alter the values of these parameters to examine their…
Hyperspace analog to language (HAL) is a high-dimensional model of semantic space that uses the global co-occurrence frequency of words in a large corpus of text as the basis for a representation of semantic memory. In the original HAL model, many parameters were set without any a priori rationale. We have created and publicly released a computer application, the High Dimensional Explorer (HiDEx), that makes it possible to systematically alter the values of these parameters to examine their effect on the co-occurrence matrix that instantiates the model. We took an empirical approach to understanding the influence of the parameters on the measures produced by the models, looking at how well matrices derived with different parameters could predict human reaction times in lexical decision and semantic decision tasks. New parameter sets give us measures of semantic density that improve the model’s ability to predict behavioral measures. Implications for such models are discussed.
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