analysis:course:week7
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| * Test for coupling between delta phase and low-gamma amplitude in a ventral striatal LFP | * Test for coupling between delta phase and low-gamma amplitude in a ventral striatal LFP | ||
| + | Resources: | ||
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| + | * (background reading, a short review on cross-frequency coupling) Jensen and Colgin, TICS 2007 | ||
| + | * (optional, a nice application of the tools covered here) Tort et al. PNAS 2008 | ||
| ==== Introduction ==== | ==== Introduction ==== | ||
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| ☛ Subtract the mean from the rectified signal and plot the acorr again. Verify that the value at lag 1 matches the output of ''corrcoef()'' for lag 1. | ☛ Subtract the mean from the rectified signal and plot the acorr again. Verify that the value at lag 1 matches the output of ''corrcoef()'' for lag 1. | ||
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| === Application to real data === | === Application to real data === | ||
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| In the previous section, we explored the relationships between different power bands of a signal. Such relationships are a form of //cross-frequency coupling//: what happens in one frequency band depends on what happens in another. Such cross-frequency relationships are not limited to //power//, but can also extend to //phase//, as the following figure (from [[http://www.ncbi.nlm.nih.gov/pubmed/17548233 | Jensen and Colgin, 2007]]) illustrates: | In the previous section, we explored the relationships between different power bands of a signal. Such relationships are a form of //cross-frequency coupling//: what happens in one frequency band depends on what happens in another. Such cross-frequency relationships are not limited to //power//, but can also extend to //phase//, as the following figure (from [[http://www.ncbi.nlm.nih.gov/pubmed/17548233 | Jensen and Colgin, 2007]]) illustrates: | ||
| - | {{:analysis:course:jensen_colgin_fig1.png?750|}} | + | {{ :analysis:course:jensen_colgin_fig1.png?750 |}} |
| The power-to-power coupling (a) we have explored using the correlation matrix of the spectrogram. To reveal cross-frequency coupling involving phase, we need a way to extract the phase of a signal. One way to accomplish this is to use the Hilbert transform: | The power-to-power coupling (a) we have explored using the correlation matrix of the spectrogram. To reveal cross-frequency coupling involving phase, we need a way to extract the phase of a signal. One way to accomplish this is to use the Hilbert transform: | ||
analysis/course/week7.1383016371.txt.gz · Last modified: 2018/07/07 10:19 (external edit)
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