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Cortical functional connectivity during the retention of affective pictures in working memory: EEG-source theta coherence analysis

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The pattern of cortical functional connectivity in the source space was studied in a group of righthanded adult participants (N = 44:17 women, 27 men, aged M = 29.61 ± 6.45 years). Participants retained the traces of realistic pictures of positive, neutral, and negative emotional valences in their working memory (WM) while performing the same-different task. Within the framework of this task, participants had to compare the initial picture against a target picture that followed after a specified delay. The coherence (COH) between the pairs of cortical sources chosen in advance according to fMRI data was estimated in the theta frequency range for the period preceding the initial stimulus, during the retention of the initial stimulus in WM, and during the rest interval between successive trials. Two distinct sets of functional links were found. The links of the first type that presumably reflected the involvement of sustained attention were between the dorsal anterior cingulate cortex, the prefrontal areas, and temporal areas of the right hemispheres. When compared to the rest period, the links of this type showed strengthening not only during the retention period but also during the period preceding the initial picture. The links of the second type presumably reflected a progressive neocortex-to-hippocampus functional integration with increasing memory load and strengthened exclusively during the retention period. These links were between the parietal, temporal and prefrontal cortices in the lateral surface of both hemispheres with the additional inclusion of the posterior cingulate cortex and the medial parietal cortex in the left hemisphere. The impact of emotional valence on the strength and topography of the functional links of the second type was found. In the left hemisphere, the increase of strength of cortical interaction was more pronounced for the pictures of positive valence than for the pictures of either neutral or negative valences. When compared to the pictures of neutral valence, the retention of pictorial information of both positive and negative valence showed some extraneous integration of the cortical areas for the theta rhythm. This finding might be related to the additional load exerted by emotionally colored pictures onto the mechanisms of short-time retention of visual information.

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Authors and Affiliations

  1. Institute of Developmental Physiology, Russian Academy of Education, Moscow, Russia

    R. I. Machinskaya, R. I. Rozovskaya & A. V. Kurgansky

  2. Federal Center of Treatment and Rehabilitation, Moscow, Russia

    E. V. Pechenkova

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  1. R. I. Machinskaya
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  2. R. I. Rozovskaya
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  3. A. V. Kurgansky
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  4. E. V. Pechenkova
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Correspondence to R. I. Machinskaya.

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Original Russian Text © R.I. Machinskaya, R.I. Rozovskaya, A.V. Kurgansky, E.V. Pechenkova, 2016, published in Fiziologiya Cheloveka, 2016, Vol. 42, No. 3, pp. 56–73.

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Machinskaya, R.I., Rozovskaya, R.I., Kurgansky, A.V. et al. Cortical functional connectivity during the retention of affective pictures in working memory: EEG-source theta coherence analysis. Hum Physiol 42, 279–293 (2016). https://doi.org/10.1134/S0362119716020122

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