Archive for April, 2009
April 30th, 2009 19:04:07
Swept Sine against MLS in room acoustics with music signals as background noise.
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Swept Sine against MLS in room acoustics with music signals as background noise.
J Acoust Soc Am. 2008 May;123(5):3617
Authors: Paulo JP, Bento Coelho JL
The Swept Sine and the MLS techniques are very popular in room acoustic measurement set-ups. Advantages and disadvantages of both methods have been well investigated and can be found in the literature. However, information regarding the performance of these techniques in the presence of high background music levels is scarce. Since the estimation of the room impulse response is based on the correlation between signals, the likelihood between the test signal and the music contents has an important role on the results accuracy. This paper explores these issues by taking into account the semantic information of the music signals when used as disturbance. The method used for the assessment of the gain between the two techniques consists on splitting each frame in segments and applying a weighting function depending on a likelihood function. The features used for the likelihood function are the rms value of each segment, spectral energy envelope relation, bandwidth and harmonic structure. Several examples are presented for comparison of the performance of the Swept Sine and the MLS techniques. Advantages and disadvantages of each technique are discussed for music signals as noise.
PMID: 18531546 [PubMed - in process]
April 29th, 2009 11:04:12
Music experience influences laparoscopic skills performance.
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Music experience influences laparoscopic skills performance.
JSLS. 2008 Jul-Sep;12(3):292-4
Authors: Boyd T, Jung I, Van Sickle K, Schwesinger W, Michalek J, Bingener J
BACKGROUND: Music education affects the mathematical and visuo-spatial skills of school-age children. Visuo-spatial abilities have a significant effect on laparoscopic suturing performance. We hypothesize that prior music experience influences the performance of laparoscopic suturing tasks. METHODS: Thirty novices observed a laparoscopic suturing task video. Each performed 3 timed suturing task trials. Demographics were recorded. A repeated measures linear mixed model was used to examine the effects of prior music experience on suturing task time. RESULTS: Twelve women and 18 men completed the tasks. When adjusted for video game experience, participants who currently played an instrument performed significantly faster than those who did not (P<0.001). The model showed a significant sex by instrument interaction. Men who had never played an instrument or were currently playing an instrument performed better than women in the same group (P=0.002 and P<0.001). There was no sex difference in the performance of participants who had played an instrument in the past (P=0.29). CONCLUSION: This study attempted to investigate the effect of music experience on the laparoscopic suturing abilities of surgical novices. The visuo-spatial abilities used in laparoscopic suturing may be enhanced in those involved in playing an instrument.
PMID: 18765055 [PubMed - in process]
April 26th, 2009 2:04:43
Auditory feedback in music performance: The role of transition-based similarity.
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Auditory feedback in music performance: The role of transition-based similarity.
J Exp Psychol Hum Percept Perform. 2008 Jun;34(3):708-25
Authors: Pfordresher PQ
Past research has suggested that the disruptive effect of altered auditory feedback depends on how structurally similar the sequence of feedback events is to the planned sequence of actions. Three experiments pursued one basis for similarity in musical keyboard performance: matches between sequential transitions in spatial targets for movements and the melodic contour of auditory feedback. Trained pianists and musically untrained persons produced simple tonal melodies on a keyboard while hearing feedback sequences that either matched the planned melody or were contour-preserving variations of that melody. Sequence production was disrupted among pianists when feedback events were serially shifted by one event, similarly for shifts of planned melodies and tonal variations but less so for shifts of atonal variations. Nonpianists were less likely to be disrupted by serial shifts of variations but showed similar disruption to pianists for shifts of the planned melody. Thus, transitional properties and tonal schemata may jointly determine perception-action similarity during musical sequence production, and the tendency to generalize from a planned sequence to variations of it may develop with the acquisition of skill. (PsycINFO Database Record (c) 2008 APA, all rights reserved).
PMID: 18505333 [PubMed - in process]
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