Methods for predicting cortical UP and DOWN states from the phase of deep layer local field potentials.
During anesthesia, slow-wave sleep and quiet wakefulness, neuronal membrane potentials collectively switch between de- and hyperpolarized levels, the cortical UP and DOWN states. Previous studies have shown that these cortical UP/DOWN states affect the excitability of individual neurons in response to sensory stimuli, indicating that a significant amount of the trial-to-trial variability in neuronal responses can be attributed to ongoing fluctuations in network activity. However, as intracellular recordings are frequently not available, it is important to be able to estimate their occurrence purely from extracellular data. Here, we combine in vivo whole cell recordings from single neurons with multi-site extracellular microelectrode recordings, to quantify the performance of various approaches to predicting UP/DOWN states from the deep-layer local field potential (LFP). We find that UP/DOWN states in deep cortical layers of rat primary auditory cortex (A1) are predictable from the phase of LFP at low frequencies (< 4 Hz), and that the likelihood of a given state varies sinusoidally with the phase of LFP at these frequencies. We introduce a novel method of detecting cortical state by combining information concerning the phase of the LFP and ongoing multi-unit activity.
Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK. aman.saleem04@imperial.ac.uk.
Aman B
AB
Saleem
UCL Ear Institute, 332 Grays Inn Road, London, WC1X 8EE, UK.|Center for Molecular and Behavioral Neuroscience, Rutgers University, 197 University Avenue, Newark, NJ, 07102, USA.
Paul
P
Chadderton
Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK.
John
J
Apergis-Schoute
Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK.|Center for Molecular and Behavioral Neuroscience, Rutgers University, 197 University Avenue, Newark, NJ, 07102, USA.
Kenneth D
KD
Harris
Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK.
Simon R
SR
Schultz
D000161:Acoustic Stimulation / Q000379:methods; D000200:Action Potentials / Q000502:physiology*; D000818:Animals; D000831:Animals, Newborn; D001303:Auditory Cortex / Q000166:cytology*; D055592:Biophysical Phenomena / Q000502:physiology*; D001931:Brain Mapping; D005071:Evoked Potentials / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D018408:Patch-Clamp Techniques / Q000379:methods; D011237:Predictive Value of Tests; D051381:Rats