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- Heimann, Mikael, 1951-, et al.
(författare)
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Associative learning measured with ERP predicts deferred imitation using a strict observation only design in 14 to 15 month old children
- 2013
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Ingår i: Scandinavian Journal of Psychology. - : Wiley-Blackwell. - 0036-5564 .- 1467-9450. ; 54:1, s. 33-40
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Tidskriftsartikel (refereegranskat)abstract
- Deferred imitation is an established procedure for behavioural measurement of early declarative-like memories in infancy and previous work has indicated a link between this type of memory and brain potentials in infants. The present study compared infants’ memory performance in this paradigm with electrophysiological indices of associative learning. Thirty children (mean age: 14.5 months) participated, of which 15 (9 boys) had acceptable ERP recordings that could be included in the final analysis. Deferred imitation was measured with an observation-only procedure using three actions and a 30 min delay. ERP was recorded with a High Density Net (128 electrodes) during associative learning. Change scores based on Nc, a middle latency component associated with attentional processes, predicted deferred imitation performance. Thus, associative learning measured with ERP predicts deferred imitation using a strict observation only design in 14 to15 month old children.
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- Heimann, Mikael, 1951-, et al.
(författare)
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Behavioral and electrophysiological indices of learning in 14-month-old infants : Deferred imitation correlates with the Nc component
- 2010
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Ingår i: Developmental Psychobiology, Volume 52, Issue 7. - : Wiley. ; , s. 702-702
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Deferred imitation (DI) is an established memory paradigm that reflects early individual differences but the neural activity underlying DI is to a large extent uncharted. Thus, the present study investigated the relationship between event-related potentials (ERP) and behavioral (DI) indices of learning.Thirty 14-months-old children participated in the study, of which 15 (9 boys) had acceptable ERP data to be included in the analysis. DI was measured with the observation-only design using three actions and a 30 min delay. ERP was recorded with a High Density Net (128 electrodes) and the learning phase consisted of two pairs of pictures presented six times (PRES 1, 2, 3, 4, 5, and 6) while the test phase consisted of two violations: Associating two familiar pictures in a new combination (ASSO) or associating one familiar picture with a novel picture (NOV).The mean score of DI was 1.87 (SD = 1.06) and ERP data revealed an Nc within 300-600 ms post stimuli. The mean amplitude was higher for ASSO compared with PRES 5 and 6 (p < .05) but not between NOV and PRES 5 (p = .055) and PRES 6 (ns). Larger Nc change scores (ASSO - PRES5) correlated with better DI performance, rs (15) = .57; p < .05.These findings, if upheld in further analyses, suggest that behavioral memory performance is related to attention processes as reflected in the observed Nc. (FUNDING: Swedish Council for Working Life and Social Research # 2006-1040)
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- Johansson, Mikael, et al.
(författare)
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Memory for perceived and imagined pictures : an event-related potential study
- 2002
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Ingår i: Neuropsychologia, vol. 40, no. 7. - : Elsevier. ; 40:7, s. 986-1002
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Konferensbidrag (refereegranskat)abstract
- Event-related potentials (ERPs) and behavioural measures were used to investigate recognition memory and source-monitoring judgements about previously perceived and imagined pictures. At study, word labels of common objects were presented. Half of these were followed by a corresponding picture and the other half by an empty frame, signalling to the participants to mentally visualise an image. At test, participants in a source-monitoring task made a three-way discrimination between new words and words corresponding to previously perceived and imagined pictures. Participants in an old/new-recognition task indicated whether test words were previously presented or not. In both tasks, correctly identified old items elicited more positive-going ERPs than correctly judged new items. This widely distributed old/new effect was found to have an earlier onset and to be of a greater magnitude for imagined than for perceived items. Task (source versus item-memory) affected the old/new effects over prefrontal areas and the reaction times to remembered old items. The present findings are consistent with the view that a greater amount, or a different type, of information is necessary for accurate source-memory judgements than for correct recognition, and moreover, that different types of source-specifying information revive at different rates. In addition, the results add weight to the view that the late widespread ERP-old/new effect is sensitive to the quality or the amount of information retrieved from memory.
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- Lindgren, Anders E. G., et al.
(författare)
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Total Synthesis of the Resveratrol Oligomers (+/-)-Ampelopsin B and (+/-)-E-Viniferin
- 2016
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Ingår i: European Journal of Organic Chemistry. - : Wiley. - 1434-193X .- 1099-0690. ; :3, s. 426-429
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Tidskriftsartikel (refereegranskat)abstract
- The total synthesis of the resveratrol dimers (+/-)-ampelopsin B and (+/-)-E-viniferin is reported. Highlights of the approach include the use of cyclopropylmethyl groups to protect aromatic alcohols. This group allows an acid promoted three-step, one-pot deprotection-epimerization-cyclization of an advanced intermediate to give (+/-)-ampelopsin B. An important advantage with our strategy is the possibility of synthesizing analogs to these natural products to further study the chemistry and biology of resveratrol oligomers.
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- Lindgren, Johan, et al.
(författare)
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The first neoceratopsian dinosaur remains from Europe
- 2007
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Ingår i: Palaeontology. - : Wiley. - 1475-4983 .- 0031-0239. ; 50:4, s. 929-937
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Tidskriftsartikel (refereegranskat)abstract
- Shallow marine, nearshore strata of earliest Campanian (Gonioteuthis granulataquadrata belemnite Zone) and latest Early Campanian (informal Belemnellocamax mammillatus belemnite zone) age in the Kristianstad Basin, southern Sweden, have yielded isolated leptoceratopsid teeth and vertebrae, representing the first record of horned dinosaurs from Europe. The new leptoceratopsid occurrence may support a European dispersal route for the Leptoceratopsidae, or may represent an entirely endemic population. The presence of leptoceratopsid teeth in shallow marine deposits contradicts previous hypotheses suggesting that basal neoceratopsians mainly preferred and and/or semi-arid habitats far from coastal areas.
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