I got bad result when trying to use cwt with 'morl' windowĬomputational modeling of distinct neocortical oscillations driven by cell-type selective optogenetic drive: separable resonant circuits controlled by low-threshold spiking and fast-spiking interneurons.
#Morlet wavelet matlab code code#
Example of wavelet transform The following matlab project contains the source code and matlab examples used for wavelet transform.
#Morlet wavelet matlab code how to#
I only managed to get some "good" results using spectrogram function in matlab.īut I dont have much idea of how to use the morlet complex wavelet. Wavelet series is a representation of a square-integrable (real- or complex-valued) function by a certain orthonormal series generated by a wavelet. The normalizationįactor was A = 1 /(σ (2π)^0.5 ), and the constant m defining the compromise between time and frequency resolution was 7. W(t,f0 ) = Aexp(−t^2 / 2*σ^2 )exp(2*i πf0*t)įor each frequency of interest f0, where σ = m/2πf0, and i is the imaginary unit. Time–frequency spectrograms of the data from 1–88 Hz by convolving the signals with a complex Morlet wavelet of the form Although -4, 4 is the correct theoretical effective support, a wider effective support, -8, 8, is used in the computation to provide more accurate results. Nearly 100 of the wavelet's energy is in the interval. " Power estimates from the averaged LFPs were calculated from The Morlet wavelet has the interval -4, 4 as effective support. The article state that they used Complex Morlet wavelet to create the spectrogram:
'Stimulus specificity of phase-locked and non-phase-locked 40 Hz visual responses in human.' Journal of Neuroscience 16.13 (1996): 4240-4249. The time is in milliseconds (frequency is 40000 Hz) waveletmatlab just to test how the cwt works (Wavelet Toolbox needed) comparingmorletformulas is a comparison between cmorwavf and the one present in: Tallon-Baudry, Catherine, et al. If I want to average the results among 5 subjects, I would put the results in a new folder in.
Then I got the results, like Power, 1-50Hz (EEG) multiply. I am trying to recreate the following results: A question about time-frequency (Morlet wavelets ) I used the interface of the process Frequency > Time-frequency (Morlet wavelets) to analysis my data of two groups subjects.