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Train your brain: updating, transfer, and neural changes
Umeå universitet, Medicinska fakulteten, Institutionen för integrativ medicinsk biologi (IMB), Fysiologi. Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper. Umeå universitet, Medicinska fakulteten, Umeå centrum för funktionell hjärnavbildning (UFBI).
2009 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)Alternativ tittel
Träning av hjärnan : uppdatering, transfer effekter, och neurala förändringar (svensk)
Abstract [en]

An initial aim of this thesis was to determine whether training of a specific executive function (updating) produces improvements in performance on trained and transfer tasks, and whether the effects are maintained over time. Neural systems underlying training and transfer effects were also investigated and one question considered is whether transfer depends on general or specific neural overlap between training and transfer tasks. An additional aim was to identify how individual differences in executive functioning are mapped to functional brain changes. In Study I, significant training-related changes in performance on the letter memory criterion task were found in both young and older adults after 5 weeks of updating training. Transfer to a 3-back test of updating was also demonstrated in the young adults. Functional Magnetic Resonance Imaging (fMRI) revealed overlapping activity in letter memory and 3-back tasks in fronto-parietal areas and striatum pre-training, and a joint training-related activity increase for the tasks in a striatal region. No transfer was observed to a task (Stroop) that engaged fronto-parietal areas, but not the striatal region and updating per se. Moreover, age-related striatal changes imposed constraints on transfer. In Study II, additional transfer tasks and a test of long-term maintenance were included. Results revealed that training-related gains in performance were maintained 18 months post-training in both young and older adults, whereas transfer effects were limited to tasks requiring updating and restricted to young participants. In Study III, analyses of brain activity and performance during n-back (1/2/3-back) were executed. This task enables manipulation of executive demand, which permits examination of how individual differences in executive functioning can be mapped to functional brain changes. Relative to a young high-

performing group, capacity constraints in executive functioning were apparent between 1–2-back for the elderly participants and between 2–3-back for a young low-performing group. Capacity constraints in neural activity followed this pattern by showing a monotonically increasing response in the parietal cortex and the thalamus for young high performers, whereas activity levelled off at 1-back for elderly performers and at 2-back for young low performers. The response in the dorsal frontal cortex followed a similar pattern. Together, these findings indicate that fronto-parietal as well as sub-cortical areas are important for individual differences in executive functioning, training of updating and transfer effects.

sted, utgiver, år, opplag, sider
Umeå: Department of Integrative Medical Biology, Section for Physiology, Umeå university , 2009. , s. 58
Serie
Umeå University medical dissertations, ISSN 0346-6612 ; 1283
Emneord [en]
cognitive training, executive functioning, transfer, fMRI, brain system, young adults, elderly, practice, neural correlates, individual differences
HSV kategori
Forskningsprogram
fysiologi
Identifikatorer
URN: urn:nbn:se:umu:diva-26606ISBN: 978-91-7264-834-0 (tryckt)OAI: oai:DiVA.org:umu-26606DiVA, id: diva2:272763
Utgiver:
Fysiologi, 901 87, Umeå
Disputas
2009-11-13, Biologihuset, BiA201, Umeå Universitet, Umeå, 10:00 (svensk)
Opponent
Veileder
Tilgjengelig fra: 2009-10-27 Laget: 2009-10-16 Sist oppdatert: 2018-01-12bibliografisk kontrollert
Delarbeid
1. Transfer of learning after updating training mediated by the striatum
Åpne denne publikasjonen i ny fane eller vindu >>Transfer of learning after updating training mediated by the striatum
Vise andre…
2008 (engelsk)Inngår i: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 320, nr 5882, s. 1510-1512Artikkel i tidsskrift (Fagfellevurdert) 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.

HSV kategori
Forskningsprogram
medicin; psykologi
Identifikatorer
urn:nbn:se:umu:diva-10392 (URN)10.1126/science.1155466 (DOI)
Tilgjengelig fra: 2008-09-03 Laget: 2008-09-03 Sist oppdatert: 2018-06-09bibliografisk kontrollert
2. Plasticity of executive functioning in young and older adults: immediative training gains, transfer, and long-term maintenance
Åpne denne publikasjonen i ny fane eller vindu >>Plasticity of executive functioning in young and older adults: immediative training gains, transfer, and long-term maintenance
2008 (engelsk)Inngår i: Psychology and Aging, ISSN 0882-7974, E-ISSN 1939-1498, Vol. 23, nr 4, s. 720-730Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
American Psychological Association, 2008
Emneord
executive training, age-related differences, plasticity, maintenance, transfer
HSV kategori
Forskningsprogram
medicinsk beteendevetenskap; psykologi
Identifikatorer
urn:nbn:se:umu:diva-18299 (URN)10.1037/a0014296 (DOI)
Tilgjengelig fra: 2009-02-03 Laget: 2009-02-03 Sist oppdatert: 2018-06-09bibliografisk kontrollert
3. Neural correlates of variable working memory load across adult age and skill: dissociative patterns within the fronto-parietal network
Åpne denne publikasjonen i ny fane eller vindu >>Neural correlates of variable working memory load across adult age and skill: dissociative patterns within the fronto-parietal network
2009 (engelsk)Inngår i: Scandinavian Journal of Psychology, ISSN 0036-5564, E-ISSN 1467-9450, Vol. 50, nr 1, s. 41-46Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
John Wiley & Sons Inc., 2009
Emneord
fMRI, working memory load, capacity-constraints
HSV kategori
Forskningsprogram
medicin
Identifikatorer
urn:nbn:se:umu:diva-32023 (URN)10.1111/j.1467-9450.2008.00678.x (DOI)18705668 (PubMedID)
Tilgjengelig fra: 2010-02-26 Laget: 2010-02-26 Sist oppdatert: 2018-06-08bibliografisk kontrollert

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