g. N1) was kept constant across the board. Because absolute values of the P3a, P3b and RON components of the deviant waveforms carry little significance without a comparison with standard waveforms, we first measured the mean amplitude of these components as elicited by both the deviant and the standard sounds, and then performed statistical
analysis on the difference between the two by subtracting the standard from the deviant values for each electrode site. Repeated-measures anovas were used to evaluate behavioral and ERP results. The following factors were used: group (musicians vs. non-musicians), www.selleckchem.com/screening/protease-inhibitor-library.html naturalness (NAT vs. ROT), sound type (music vs. voice), stimulus type (standards vs. deviants), hemisphere (left vs. right) and site. Main effects of naturalness and sound type in the N1 analysis are not discussed because these sound categories differ in acoustic properties. However, those interactions between naturalness and other factors and between sound type and other factors that identified differences between acoustically similar sounds have been analysed and are reported. Main effects of naturalness and sound type are reported for
the P3a, Ku-0059436 cell line P3b and RON analyses. Significant main effects with more than two levels were evaluated with a Bonferroni post hoc analysis. In cases where the omnibus analysis produced a significant interaction, it was further evaluated with step-down anovas or t-tests, with factors specific to any given interaction. For all repeated measures with greater than one degree of freedom in the numerator, the Huynh–Feldt (H-F) adjusted P-values were used to determine significance (Hays, 1994). Effect sizes, indexed by the partial-eta squared statistic (ηp2), are reported for all significant anova effects. All reported t-tests are two-tailed. To have a more objective measure of participants’ musical ability, all participants were administered the Melody part of the Music Aptitude Profile (MAP; Gordon, 2001) test. The Melody subtest consists of pairs of short melodies – a musical
question Farnesyltransferase and a musical answer, according to the authors’ terminology. Both melodies contain short musical phrases. In some cases, a musical answer is a melodic variation on the musical question, with extra notes added to it. In such cases, if the extra notes were removed, the question and the answer would be the same. In other cases, the musical answer is not a melodic variation on the musical question. Test takers are instructed to decide whether the musical question and the musical answer are ‘like’ or ‘different’. We compared the two groups on the number of incorrectly answered items out of a total of 40. Predictably, the two groups differed significantly, with overall fewer errors by musicians (mean 5.5, SD 4.33, range 0–14) compared with non-musicians (mean 10.6, SD 3.
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