Kraskov, Alexander and Quian Quiroga, Rodrigo and Reddy, Leila and Fried, Itzhak and Koch, Christof (2007) Local Field Potentials and Spikes in the Human Medial Temporal Lobe are Selective to Image Category. Journal of Cognitive Neuroscience, 19 (3). pp. 479-492. ISSN 0898-929X. http://resolver.caltech.edu/CaltechAUTHORS:20130816-103210294
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Local field potentials (LFPs) reflect the averaged dendrosomatic activity of synaptic signals of large neuronal populations. In this study, we investigate the selectivity of LFPs and single neuron activity to semantic categories of visual stimuli in the medial temporal lobe of nine neurosurgical patients implanted with intracranial depth electrodes for clinical reasons. Strong selectivity to the category of presented images was found for the amplitude of LFPs in 8% of implanted microelectrodes and for the firing rates of single and multiunits in 14% of microelectrodes. There was little overlap between the LFP- and spike-selective microelectrodes. Separate analysis of the power and phase of LFPs revealed that the mean phase was category-selective around the θ frequency range and that the power of the LFPs was category-selective for high frequencies around the γ rhythm. Of the 36 microelectrodes with amplitude-selective LFPs, 30 were found in the hippocampus. Finally, it was possible to readout information about the category of stimuli presented to the patients with both spikes and LFPs. Combining spiking and LFP activity enhanced the decoding accuracy in comparison with the accuracy obtained with each signal alone, especially for short time intervals.
|Additional Information:||c2007 Massachusetts Institute of Technology. We thank all patients for their participation and Eric Behnke, Tony Fields, Emily Ho, Eve Isham, and Charles Wilson for technical assistance. We also would like to thank Gabriel Kreiman and Daniel Rizzuto for helpful discussions. This work was supported by grants from the NINDS, NIMH, NSF, DARPA, EPSRC, the Office of Naval Research, the W.M. Keck Foundation Fund for Discovery in Basic Medical Research, the Gordon Moore Foundation, the Sloan Foundation, and the Swartz Foundation for Computational Neuroscience.|
|Group:||Koch Laboratory, KLAB|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||KLAB Import|
|Deposited On:||12 Jan 2008 01:58|
|Last Modified:||03 Apr 2014 20:38|
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