Archive for August, 2009
August 30th, 2009 22:08:49
The Art of Artificial Evolution: A Handbook on Evolutionary Art and Music. Juan Romero and Penousal Machado (Eds.). (2007, Springer-Verlag.) $119.00 (hardback), 458 pages.
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The Art of Artificial Evolution: A Handbook on Evolutionary Art and Music. Juan Romero and Penousal Machado (Eds.). (2007, Springer-Verlag.) $119.00 (hardback), 458 pages.
Artif Life. 2009 Jan 14;
Authors: Eldridge A
PMID: 19199388 [PubMed - as supplied by publisher]
August 30th, 2009 22:08:42
Output sound pressure levels of personal music systems and their effect on hearing.
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Output sound pressure levels of personal music systems and their effect on hearing.
Noise Health. 2009 Jul-Sep;11(44):132-40
Authors: Kumar A, Mathew K, Alexander SA, Kiran C
This study looked at output levels produced by new generation personal music systems (PMS), at the level of eardrum by placing the probe microphone in the ear canal. Further, the effect of these PMS on hearing was evaluated by comparing the distortion product otoacoustic emissions and high frequency pure tone thresholds (from 3 kHz to 12 kHz) of individuals who use PMS to that of age matched controls who did not use PMS. The relationship between output sound pressure levels and hearing measures was also evaluated. In Phase I output SPLs produced by the PMS were measured in three different conditions - a) at volume control setting that was preferred by the subjects in quiet b) at volume control setting that was preferred by the subject in presence of 65 dB SPL bus noise c) at maximum volume control settings of the instrument. In Phase II pure tone hearing thresholds and DPOAEs were measured. About 30% of individuals in a group of 70 young adults listened to music above the safety limits (80 dBA for 8 hours) prescribed by Ministry of Environment and Forests, India. Addition of bus noise did not increase the preferred volume control settings of the subjects significantly. There were no significant differences between the experimental and control groups for mean pure tone threshold and for mean DPOAE amplitude comparisons. However, a positive correlation between hearing thresholds and music levels and a negative correlation between DPOAE measures and music levels were found.
PMID: 19602765 [PubMed - in process]
August 29th, 2009 14:08:36
Three-way matrix analysis, the MUSIC algorithm and the coupled dipole model.
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Three-way matrix analysis, the MUSIC algorithm and the coupled dipole model.
J Neurosci Methods. 2009 Jul 7;
Authors: de Munck JC, Bijma F
The inverse problem of multi channel MEG/EEG data is considered as a parameter estimation problem. The stability of the solution of the inverse problem, which decreases with the number of included dipoles, can be improved by either adding constraints to the model parameters, or by adding more data of related data sets. The latter approach was taken by Bijma et al (2004, 2005) by introducing coupling matrices that link dipole parameters and source time functions of different data sets. Here, the theoretical foundations of the coupled dipole model are explored and the MUSIC algorithm is generalized to the analysis of multiple related data sets. Similar to the MUSIC algorithm, the number of sources and the number of constraints are derived from the data by considering the minimum possible residual error as a function of the number of sources and constraints. However, contrary to the MUSIC algorithm, where the minimum residual error can be obtained from an SVD analysis of a two-way data matrix, here we deal with multiple data sets and therefore three-way matrix analysis is used. From a simulation study it appears that the number of sources and constraints can be clearly determined from a generalized SVD analysis. The generalization of the MUSIC algorithm to three-way data gives reasonable estimates of the dipole parameters. These results can be used in the simultaneous analysis of MEG/EEG data of multiple subjects, multiples data sets of the same subject or models where subsequent trials of data show habituation effects.
PMID: 19591868 [PubMed - as supplied by publisher]
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