Music Therapy Today - World Federation of Music Therapy

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Sparse time-frequency representations OUTDOORLINKS: Maarten de Rijke was aimed at highly experienced researchers of a professorial level. It is comparable to the present Vici subsidy from NWO. http://staff.science.uva.nl/~mdr/ Gilad Mishne http://staff.science.uva.nl/~gilad/ Krisztian Balog http://staff.science.uva.nl/~kbalog/ Sparse time-frequency representations By Timothy J. Gardner and Marcelo O. Magnasco Source: www.pnas.org/ April 18, 2006 http://www.pnas.org/cgi/content/abstract/103/16/6094?etoc PNAS | April 18, 2006 | vol. 103 | no. 16 | 6094-6099 Published online before print April 6, 2006, 10.1073/pnas.0601707103 Auditory neurons preserve exquisite temporal information about sound features, but we do not know how the brain uses this information to pro- cess the rapidly changing sounds of the natural world. Odds and ends - themes and trends 491
Sparse time-frequency representations Simple arguments for effective use of temporal information led us to con- sider the reassignment class of time-frequency representations as a model of auditory processing. Reassigned time-frequency representations can track isolated simple signals with accuracy unlimited by the time-frequency uncertainty principle, but lack of a general theory has hampered their application to complex sounds. We describe the reassigned representations for white noise and show that even spectrally dense signals produce sparse reassignments: the represen- tation collapses onto a thin set of lines arranged in a froth-like pattern. Preserving phase information allows reconstruction of the original signal. We define a notion of "consensus," based on stability of reassignment to time-scale changes, which produces sharp spectral estimates for a wide class of complex mixed signals. As the only currently known class of time-frequency representations that is always "in focus" this methodology has general utility in signal analy- sis. It may also help explain the remarkable acuity of auditory perception. Many details of complex sounds that are virtually undetectable in stan- dard sonograms are readily perceptible and visible in reassignment. To whom correspondence should be addressed. Marcelo O. Magnasco E-mail: magnasco(at)rockefeller.edu Odds and ends - themes and trends 492
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Music Therapy Today Vol. VII (2) (J
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Page 177 and 178: Brain Reader Part 1: Researchers ca
Page 183 and 184: Brain Reader Part 2: As we age, our
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Page 187 and 188: Neurogenesis Not Needed for Environ
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Page 199 and 200: Cortex Matures Faster in Youth with
Page 201 and 202: Effects of Music Therapy and Counse
Page 203 and 204: Music fingerprinting system is fast
Page 205 and 206: Functional Imaging of Numerical Pro
Page 207 and 208: Music Therapy in New Orleans Music
Page 209 and 210: At Some Medical Schools, Humanities
Page 215 and 216: Neocortical Connectivity during Epi
Page 217: The mood of the Internet Researcher
Page 221 and 222: Why life oscillates - from a topogr
Page 223 and 224: Neurons in the orbitofrontal cortex
Page 225 and 226: Meditating Brains But the benefits
Page 227 and 228: Meditating Brains see if cognitive
Page 229 and 230: The GABAB1b Isoform Mediates Long-L
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Music Therapy Today - World Federation of Music Therapy

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