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Categorization and attentional templates in working memory: an event-related potential (ERP) study
This study is devoted to the investigation of neural correlates of attentional template formation in categorical search. The categorization process plays a crucial role in optimizing information processing and storage in working memory. Categories are divided into subordinate, basic and superordinate levels, which determine the degree of specificity and clarity of representation. Attentional templates contain attributes that define the target, such as color, shape, or size, and are activated in preparation for retrieval. The aim of the study was to examine the difference in the neurophysiological mechanisms of attentional template formation under the influence of verbally given categories of basic and superordinate levels. The category level (basic or superordinate) was manipulated, possible changes in N2pc (N2‑posterior- contralateral component) and CDA (contralateral delay activity) amplitudes were recorded as well as behavioral measures. Behavioral results were consistent with other studies of visual search and categorization. The CDA component related to visual working memory load showed no statistically significant differences, whereas the N2pc component showed classic results for visual search paradigm – it changed with lateralization and with the number of stimuli, but no effect of category level was revealed. This study showed that there are differences at the behavioral level in a categorical visual search task, but they are absent for the CDA and N2pc components amplitudes – the effect may be manifested in oscillations; a block design is probably not suitable for assessing changes in CDA amplitude, verbal presentation of categories does not lead to differences in amplitude.