کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4335561 1295165 2010 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Time–frequency analysis using damped-oscillator pseudo-wavelets: Application to electrophysiological recordings
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
Time–frequency analysis using damped-oscillator pseudo-wavelets: Application to electrophysiological recordings
چکیده انگلیسی

The damped-oscillator pseudo-wavelet is presented as a method of time–frequency analysis along with a new spectral density measure, the data power. An instantaneous phase can be defined for this pseudo-wavelet, and it is easily inverted. The data power measure is tested on both computer generated data and in vivo intrahippocampal electrophysiological recordings from a rat. The data power spectral density is found to give better time and frequency resolution than the more conventional total energy measure, and additionally shows intricate time–frequency structure in the rat that is altered in association with the emergence of epilepsy. With epileptogenesis, the baseline theta oscillation is severely degraded and is absorbed into a broader gamma band. There are also broad 600 Hz and 2000 Hz bands which localize to hippocampal layers that are distinct from those of the theta and gamma bands. The 600 Hz band decreases in prominence with epileptogenesis while the 2000 Hz band increases in prominence. The origins of these high frequency bands await further study. In general, we find that the damped-oscillator pseudo-wavelet is easy to use and is particularly suitable for problems where a wide range of oscillator frequencies is expected.

Research highlights▶ Time–frequency analysis using mathematical oscillators to detect data oscillators. ▶ High time–frequency resolution. ▶ Fast and convenient to use. ▶ Tested on computer generated and in vivo electrophysiological data.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Neuroscience Methods - Volume 194, Issue 1, 15 December 2010, Pages 179–192
نویسندگان
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