A perfect resource of analysis tools is provided by the fieldtrip open source toolbox for matlab.
It includes basic and advanced analysis scripts for action potential sequences (spiketrains) and local field potential (LFP) activity. Check, for example, the tutorials on:
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Analysis of Spiketrains, including spike density functions, action potential waveform analysis, cross-correlation analysis, functionsl connectivity analysis with joint-peristimulus time histograms etc.
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Analysis of Neuronal Synchronization, including spike-LFP coherence, spike phase consistency analysis.
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Advanced Connectivity Analysis, including various phase locking such as coherence or the weighted phase lag index, or Granger causal estimation of directed interactions in the brain.
Misc. Other Toolboxes
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Brain Connectivity Toolbox from Rubinov and Sporns (2010) Neuroimage.
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SPM-8 Toolbox (Statistical Parametric Mapping).
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Miscellaneous software tools (matlab and python) for Network analysis of parallel recorded spiketrains: and a Book on Analysis of Parallel Spike Trains
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Finding neural assemblies with ‘frequent item set mining’.