Sensory information in local field potentials and spikes from visual and auditory cortices: time scales and frequency bands |
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Authors: | Andrei Belitski Stefano Panzeri Cesare Magri Nikos K Logothetis Christoph Kayser |
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Institution: | 1.Max Planck Institute for Biological Cybernetics,Tübingen,Germany;2.Robotics, Brain and Cognitive Sciences Department, Italian Institute of Technology,Genoa,Italy;3.Division of Imaging Science and Biomedical Engineering,University of Manchester,Manchester,UK |
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Abstract: | Studies analyzing sensory cortical processing or trying to decode brain activity often rely on a combination of different
electrophysiological signals, such as local field potentials (LFPs) and spiking activity. Understanding the relation between
these signals and sensory stimuli and between different components of these signals is hence of great interest. We here provide
an analysis of LFPs and spiking activity recorded from visual and auditory cortex during stimulation with natural stimuli.
In particular, we focus on the time scales on which different components of these signals are informative about the stimulus,
and on the dependencies between different components of these signals. Addressing the first question, we find that stimulus
information in low frequency bands (<12 Hz) is high, regardless of whether their energy is computed at the scale of milliseconds
or seconds. Stimulus information in higher bands (>50 Hz), in contrast, is scale dependent, and is larger when the energy
is averaged over several hundreds of milliseconds. Indeed, combined analysis of signal reliability and information revealed
that the energy of slow LFP fluctuations is well related to the stimulus even when considering individual or few cycles, while
the energy of fast LFP oscillations carries information only when averaged over many cycles. Addressing the second question,
we find that stimulus information in different LFP bands, and in different LFP bands and spiking activity, is largely independent
regardless of time scale or sensory system. Taken together, these findings suggest that different LFP bands represent dynamic
natural stimuli on distinct time scales and together provide a potentially rich source of information for sensory processing
or decoding brain activity. |
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