Individual differences reveal limited mixed-category effects during a visual working memory task
| Autor: | Kyle Killebrew, Ryan E. B. Mruczek, Marian E. Berryhill |
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| Rok vydání: | 2018 |
| Předmět: |
Adult
Male Multivariate statistics Cognitive Neuroscience Individuality Experimental and Cognitive Psychology 050105 experimental psychology Article Task (project management) Constant false alarm rate 03 medical and health sciences Behavioral Neuroscience Young Adult 0302 clinical medicine Humans 0501 psychology and cognitive sciences Brain Mapping Working memory 05 social sciences Counterintuitive Brain Magnetic Resonance Imaging Test (assessment) Memory Short-Term Pattern Recognition Visual Mental Recall Hit rate Positive relationship Female Psychology 030217 neurology & neurosurgery Cognitive psychology |
| Zdroj: | Neuropsychologia. 122 |
| ISSN: | 1873-3514 |
| Popis: | Using stimuli from different categories may expand the capacity limits of working memory (WM) by spreading item representations across distinct neural populations. We explored this mixed-category benefit by correlating individuals’ behavioral performance with fMRI measures of category information during uniform- and mixed-category trials. Behaviorally, we found weak evidence for a mixed-category benefit at the group-level, although there was a high degree of individual variability. To test whether distinct neural patterns elicited superior performance in some individuals, we correlated a multivariate measure of neural category information with multiple behavioral metrics. This revealed a widespread positive relationship, intuitive for hit rate and working memory capacity, but counterintuitive for false alarm rate. Overall, these data suggest that mixed-category effects may support working memory performance, but unexpectedly, not all participants show this benefit. Only some people may be able to take advantage of representing mixed-category information in a differentiable way. |
| Databáze: | OpenAIRE |
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