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A balancing act of the brain: activations and deactivations driven by cognitive load.

ABSTRACT: The majority of neuroimaging studies focus on brain activity during performance of cognitive tasks; however, some studies focus on brain areas that activate in the absence of a task. Despite the surge of research comparing these contrasted areas of brain function, their interrelation is not well understood. We systematically manipulated cognitive load in a working memory task to examine concurrently the relation between activity elicited by the task versus activity during control conditions. We presented adults with six levels of task demand, and compared those with three conditions without a task. Using whole-brain analysis, we found positive linear relations between cortical activity and task difficulty in areas including middle frontal gyrus and dorsal cingulate; negative linear relations were found in medial frontal gyrus and posterior cingulate. These findings demonstrated balancing of activation patterns between two mental processes, which were both modulated by task difficulty. Frontal areas followed a graded pattern more closely than other regions. These data also showed that working memory has limited capacity in adults: an upper bound of seven items and a lower bound of four items. Overall, working memory and default-mode processes, when studied concurrently, reveal mutually competing activation patterns.

SUBMITTER: Arsalidou M

PROVIDER: S-EPMC3683287 | biostudies-literature | 2013 May

REPOSITORIES: biostudies-literature

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A balancing act of the brain: activations and deactivations driven by cognitive load.

Arsalidou Marie M Pascual-Leone Juan J Johnson Janice J Morris Drew D Taylor Margot J MJ

Brain and behavior 20130402 3

The majority of neuroimaging studies focus on brain activity during performance of cognitive tasks; however, some studies focus on brain areas that activate in the absence of a task. Despite the surge of research comparing these contrasted areas of brain function, their interrelation is not well understood. We systematically manipulated cognitive load in a working memory task to examine concurrently the relation between activity elicited by the task versus activity during control conditions. We ...[more]

PMID: 23785659

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Project description:BACKGROUND:Breastfeeding provides health benefits to both women and children. The rationale behind an individual woman's decision to breastfeed or not can depend on several factors, either independently or in combination. The aim of the current study was to explore attitudes towards breastfeeding among pregnant women in Sweden who intend to breastfeed. METHODS:Eleven mothers-to-be, one of whom had previous breastfeeding experience, participated in the study. The women were interviewed either by telephone or face-to-face during late pregnancy, with the aim of exploring their attitudes towards breastfeeding. A semi-structured interview-guide was used, and the transcripts of the interviews were analyzed using thematic analysis. The social ecological model of health is the theory-based framework underpinning this study. The model provides a comprehensive approach to understanding the factors that influence breastfeeding intention. RESULTS:When interviewed during pregnancy, women described breastfeeding as a balancing act between societal norms and personal desires. The women perceived a societal pressure to breastfeed, however it was accompanied by boundaries and mixed messages. This perceived pressure was balanced by their own knowledge of breastfeeding, in particular their knowledge of other women's experience of breastfeeding. When envisioning their future breastfeeding, the women made uncertain and preliminary plans, and negotiated the benefits and drawbacks of breastfeeding. There was a wish for individual breastfeeding support and information. CONCLUSIONS:Pregnant Swedish women perceive their future breastfeeding as a balancing act between societal norms and personal desires. These findings suggest that while discussing breastfeeding during pregnancy, it could be of interest to collect information from pregnant women on their knowledge of breastfeeding and from where they have gained this knowledge, since stories from family and friends may make them question their own capacity to breastfeed. A thorough review of the woman's experiences and attitudes of breastfeeding is important in order to offer the best evidence-based breastfeeding support. TRIAL REGISTRATION:Ethical approval for the study was obtained from the Regional Ethical Review Board in Uppsala (Dnr: 2017/256).

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A balancing act of the brain: activations and deactivations driven by cognitive load.

Publications

A balancing act of the brain: activations and deactivations driven by cognitive load.

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