| 1. |
- 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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| 2. |
- 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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| 3. |
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| 4. |
- Nordqvist, Emelie, et al.
(författare)
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An associative learning procedure measured by Event-Related Potentials correlates with event memory in 14 month old children
- 2011
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Konferensbidrag (refereegranskat)abstract
- Deferred imitation (DI) reflects an early form of event memory but the underlying neural processes is to a large degree unknown. Thus, the present study examines how associative learning observed through event-related potentials (ERP) relates to DI as measured with an observation- only design.Thirty children participated in the study and acceptable ERP data was collected from 15 (9 boys). DI was measured with a thirty minutes delay and ERP was recorded with a Geodesic High Density Net with 128 electrodes. The ERP procedure consisted of two pairs of pictures presented six times (= the learning phase) and a test phase introducing two violations: Two familiar pictures in a new combination (ASSO) or a combination of one familiar and one novel picture (NOV). In addition, visual recognition memory was also measured.ERP revealed an Nc within 300-600 ms post stimuli. A higher mean amplitude was observed for ASSO (p < .05) and a marginal effect was noted for NOV (p = .055). Better DI performance correlated with larger Nc change scores between ASSO and the last presentation in the learning phase (rs (15) = .57; p < .05). Preliminary analyses of slow waves revealed no further relationship between ERP and DI and no significant correlation between DI and novelty preference. These findings indicate that electrophysiological indices of associative learning can be related to behavioral observations of early memory processes in young infants.
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| 5. |
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| 6. |
- Nordqvist, Emelie, et al.
(författare)
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An electrophysiological index of associative learning correlates with event memories in 14 month old children
- 2011
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Deferred imitation (DI) is an early form of event memory that indexes early individual differences in infant cognition but the underlying neural processes is to a large degree uncharted. The present study examines how event-related potentials (ERPs) as a response to an associative learning procedure relates to DI measured with an observation-only design. Thirty children participated and acceptable ERP data was collected from 15 (9 boys). DI was measured with a thirty minutes delay and ERP was recorded with a Geodesic High Density Net with 128 electrodes. The ERP procedure consisted of two pairs of pictures presented six times (= the learning phase) and a test phase introducing two violations: Two familiar pictures in a new combination (ASSO) or a combination of one familiar and one novel picture (NOV). In addition, visual recognition memory was also measured. ERP revealed an Nc within 300-600 ms post stimuli. A higher mean amplitude was observed for ASSO (p < .05) and a marginal effect was noted for NOV (p = .055). Better DI performance correlated with larger Nc change scores between ASSO and the last presentation in the learning phase (rs (15) = .57; p < .05). Preliminary analyses of early and late slow waves (800 to 1500ms post stimuli) revealed no further relationship between ERP and DI and no significant correlation between DI and visual recognition memory. This finding indicates a possible direct link between electrophysiological indices of learning and behavioral observations of declarative like memory processes in young infants.
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| 7. |
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| 8. |
- Nordqvist, Emelie, et al.
(författare)
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Deferred imitation, associative memory and communication in 14-month-old children
- 2015
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Konferensbidrag (refereegranskat)abstract
- The presentation will build on two recent studies that combine behavioral observations of memory (deferred imitation, DI), electrophysiological (Event-Related Potentials, ERP) measures of associative memory and parental reports of language in 14-monthsold children. In both studies, an ERP (Nc) response indicating associative memory as well as a correlation between Nc and DI was observed. Further analysis revealed strong individual variability: The clearest relationship with ERP was noted for the subgroup of children performing non-optimally on the DI tasks. In addition, we also found a statistically significant correlation between parental report of receptive language and our ERP measure of associative memory.
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| 9. |
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| 10. |
- Nordqvist, Emelie, et al.
(författare)
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The relationship between deferred imitation, associative memory, and communication in 14-months-old children. Behavioral and electrophysiological indices
- 2015
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Ingår i: Frontiers in Psychology. - : Frontiers. - 1664-1078. ; 6:260
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Tidskriftsartikel (refereegranskat)abstract
- The present study combines behavioral observations of memory (deferred imitation, DI, after a brief delay of 30 min and after a long delay of 2-3 weeks) and electrophysiological (event-related potentials, ERPs) measures of associative memory, as well as parental reports of non-verbal and verbal communication in sixteen 14-months-old children. Results show that for DI, the children remembered the stimulus after the brief but not after the long delay. There was a clear electrophysiological response indicating associative memory. Furthermore, a correlation between DI and ERR suggests that both measures of memory (DI and associative memory) tap into similar mechanisms in 14months-old children. There was also a statistically significant relation between parental report of receptive (verbal) language and the ERP, showing an association between receptive language skills and associative memory.
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