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- Title
Empirical mode decomposition of local field potential data from optogenetic experiments.
- Authors
Oprisan, Sorinel A.; Clementsmith, Xandre; Tompa, Tamas; Lavin, Antonieta
- Abstract
Introduction: This study investigated the effects of cocaine administration and parvalbumin-type interneuron stimulation on local field potentials (LFPs) recorded in vivo from the medial prefrontal cortex (mPFC) of six mice using optogenetic tools. Methods: The local network was subject to a brief 10ms laser pulse, and the response was recorded for 2 s over 100 trials for each of the six subjects who showed stable coupling between the mPFC and the optrode. Due to the strong non-stationary and nonlinearity of the LFP, we used the adaptive, data-driven, Empirical Mode Decomposition (EMD) method to decompose the signal into orthogonal Intrinsic Mode Functions (IMFs). Results: Through trial and error, we found that seven is the optimum number of orthogonal IMFs that overlaps with known frequency bands of brain activity. We found that the Index of Orthogonality (IO) of IMF amplitudes was close to zero. The Index of Energy Conservation (IEC) for each decomposition was close to unity, as expected for orthogonal decompositions. We found that the power density distribution vs. frequency follows a power law with an average scaling exponent of ~1.4 over the entire range of IMF frequencies 2-2,000 Hz. Discussion: The scaling exponent is slightly smaller for cocaine than the control, suggesting that neural activity avalanches under cocaine have longer life spans and sizes.
- Subjects
HILBERT-Huang transform; ORTHOGONAL decompositions; PREFRONTAL cortex; LASER pulses; ENERGY conservation; POWER density
- Publication
Frontiers in Computational Neuroscience, 2023, p1
- ISSN
1662-5188
- Publication type
Article
- DOI
10.3389/fncom.2023.1223879