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Dahlin, Erika
Publications (4 of 4) Show all publications
Nyberg, L., Dahlin, E., Stigsdotter Neely, A. & Bäckman, L. (2009). Neural correlates of variable working memory load across adult age and skill: dissociative patterns within the fronto-parietal network. Scandinavian Journal of Psychology, 50(1), 41-46
Open this publication in new window or tab >>Neural correlates of variable working memory load across adult age and skill: dissociative patterns within the fronto-parietal network
2009 (English)In: Scandinavian Journal of Psychology, ISSN 0036-5564, E-ISSN 1467-9450, Vol. 50, no 1, p. 41-46Article in journal (Refereed) Published
Abstract [en]

We examined neural changes related to variations in working memory load by using an n-back task with three levels and functional magnetic resonance imaging. Younger adults were divided into high- and low-performing groups (Young-High; Young-Low) and compared with older adults. Relative to Young-High, capacity-constraints in working memory were apparent between load 1-2 for the elderly and between load 2-3 for Young-Low. Capacity-constraints in neural activity followed this pattern by showing a monotonically increasing response in parietal cortex and thalamus for Young-High, whereas activity leveled off at 1-back for the elderly and at 2-back for Young-Low. The response in dorsal frontal cortex followed a similar pattern with the addition that the magnitude of activation differed within capacity limitations (Old > Young at 1-back; Young-Low > Young-High at 2-back). These findings indicate that an important determinant of WM capacity is the ability to keep the frontal cortex adequately engaged in relation to current task demands.

Place, publisher, year, edition, pages
John Wiley & Sons Inc., 2009
Keywords
fMRI, working memory load, capacity-constraints
National Category
Medical and Health Sciences
Research subject
Medicine
Identifiers
urn:nbn:se:umu:diva-32023 (URN)10.1111/j.1467-9450.2008.00678.x (DOI)18705668 (PubMedID)
Available from: 2010-02-26 Created: 2010-02-26 Last updated: 2018-06-08Bibliographically approved
Dahlin, E., Bäckman, L., Stigsdotter Neely, A. & Nyberg, L. (2009). Training of the executive component of working memory: subcortial areas mediate transfer effects. Restorative Neurology and Neuroscience, 27(5), 405-419
Open this publication in new window or tab >>Training of the executive component of working memory: subcortial areas mediate transfer effects
2009 (English)In: Restorative Neurology and Neuroscience, ISSN 0922-6028, E-ISSN 1878-3627, Vol. 27, no 5, p. 405-419Article in journal (Refereed) Published
Abstract [en]

Purpose: Several recent studies show that training can improve working memory (WM) performance. In this review, many issues related to WM training, such as neural basis, transfer effects, and age-related changes are addressed.

Method: We focus on our own studies investigating training on tasks taxing the executive updating function and discuss our findings in relation to results from other studies investigating training of the executive component of WM.

Results: The review confirms positive behavioral effects of training on working memory. The most common neural pattern following training is fronto-parietal activity decreases. Increases in sub-cortical areas are also frequently reported after training, and we suggest that such increases indicate changes in the underlying skill following training. Transfer effects are in general difficult to demonstrate. Some studies show that older adults increase their performance after WM training. However, transfer effects are small or nonexistent in old age.

Conclusions: The main finding in this review is that sub-cortical areas seem to have a critical role in mediating transfer effects to untrained tasks after at least some forms of working memory training (such as updating).

Place, publisher, year, edition, pages
IOS Press, 2009
Keywords
fronto-parietal changes, subcortial changes, executive training, fMRI, transfer effects, aging
National Category
Psychology
Research subject
Psychology
Identifiers
urn:nbn:se:umu:diva-26962 (URN)10.3233/RNN-2009-0492 (DOI)
Available from: 2009-11-04 Created: 2009-11-04 Last updated: 2018-06-08Bibliographically approved
Dahlin, E., Nyberg, L., Bäckman, L. & Stigsdotter Neely, A. (2008). Plasticity of executive functioning in young and older adults: immediative training gains, transfer, and long-term maintenance. Psychology and Aging, 23(4), 720-730
Open this publication in new window or tab >>Plasticity of executive functioning in young and older adults: immediative training gains, transfer, and long-term maintenance
2008 (English)In: Psychology and Aging, ISSN 0882-7974, E-ISSN 1939-1498, Vol. 23, no 4, p. 720-730Article in journal (Refereed) Published
Abstract [en]

The authors investigated immediate training gains, transfer effects, and 18-month maintenance after 5 weeks of computer-based training in updating of information in working memory in young and older subjects. Trained young and older adults improved significantly more than controls on the criterion task (letter memory), and these gains were maintained 18 months later. Transfer effects were in general limited and restricted to the young participants, who showed transfer to an untrained task that required updating (3-back). The findings demonstrate substantial and durable plasticity of executive functioning across adulthood and old age, although there appear to be age-related constraints in the ability to generalize the acquired updating skill.

Place, publisher, year, edition, pages
American Psychological Association, 2008
Keywords
executive training, age-related differences, plasticity, maintenance, transfer
National Category
Medical and Health Sciences Other Social Sciences not elsewhere specified
Research subject
medical behavioral science; Psychology
Identifiers
urn:nbn:se:umu:diva-18299 (URN)10.1037/a0014296 (DOI)
Available from: 2009-02-03 Created: 2009-02-03 Last updated: 2018-06-09Bibliographically approved
Dahlin, E., Stigsdotter-Neely, A., Larsson, A., Bäckman, L. & Nyberg, L. (2008). Transfer of learning after updating training mediated by the striatum. Science, 320(5882), 1510-1512
Open this publication in new window or tab >>Transfer of learning after updating training mediated by the striatum
Show others...
2008 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 320, no 5882, p. 1510-1512Article in journal (Refereed) Published
Abstract [en]

Process-specific training can improve performance on untrained tasks, but the magnitude of gain is variable and often there is no transfer at all. We demonstrate transfer to a 3-back test of working memory after 5 weeks of training in updating. The transfer effect was based on a joint training-related activity increase for the criterion (letter memory) and transfer tasks in a striatal region that also was recruited pretraining. No transfer was observed to a task that did not engage updating and striatal regions, and age-related striatal changes imposed constraints on transfer. These findings indicate that transfer can occur if the criterion and transfer tasks engage specific overlapping processing components and brain regions.

National Category
Medical and Health Sciences Psychology
Research subject
Medicine; Psychology
Identifiers
urn:nbn:se:umu:diva-10392 (URN)10.1126/science.1155466 (DOI)
Available from: 2008-09-03 Created: 2008-09-03 Last updated: 2018-06-09Bibliographically approved
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