Sensitivity to the temporal structure of rapid sound sequences - An MEG study.
Bottom Line: Analysis of the latency of offset responses revealed that the temporal structure of (even rather simple) regular sequences is not learnt precisely when the sequences are ignored.Pattern coding, supported by a network of temporal, parietal and frontal sources, improved considerably when the signals were made behaviourally pertinent.Thus, contrary to what might be expected in the context of an 'early warning system' framework, learning of temporal structure is not automatic, but affected by the signal's behavioural relevance.
Affiliation: UCL Ear Institute, 332 Gray's Inn Road, London WC1X 8EE, UK.Show MeSH
Mentions: Offset response latencies in Experiment 1 (see Results) are used as a benchmark against which data from Experiments 2 and 3 are compared. Statistical analysis involves mixed design repeated measure ANOVAs with IOI condition as a within-subject measure and experiment as between-subject measure. These are followed by (Bonferroni corrected) post hoc analyses to assess any significant main effects. The Greenhouse–Geiser correction was used when required. Homogeneity of variance was assessed with Levene's test. The single instance in which this test indicated potential differences is between Exp2a and Exp2b (as expected due to the very different subject numbers; and as evident from Fig. 3). In all other cases there was no evidence of differences (p > 0.133 for all).
Affiliation: UCL Ear Institute, 332 Gray's Inn Road, London WC1X 8EE, UK.