Decreased but diverse activity of cortical and thalamic neurons in consciousness-impairing rodent absence seizures

Absence seizures are brief episodes of impaired consciousness, behavioral arrest, and unresponsiveness, with yet-unknown neuronal mechanisms. Here we report that an awake female rat model recapitulates the behavioral, electroencephalographic, and cortical functional magnetic resonance imaging characteristics of human seizures. Neuronally, seizures feature overall decreased but rhythmic firing of neurons in cortex and thalamus. Individual cortical and thalamic neurons express one of four distinct patterns of seizure-associated activity, one of which causes a transient initial peak in overall firing at seizure onset, and another which drives sustained decreases in overall firing. 40–60 seconds before seizure onset, there begins a decline in low-frequency electroencephalographic activity, neuronal firing, and behavior, but an increase in higher-frequency electroencephalography and rhythmicity of neuronal firing. Our findings demonstrate that prolonged brain state changes precede seizure, and consciousness-impairing seizures feature distinct functional groups of cortical and thalamic neurons resulting in an overall transient firing increase, sustained firing decrease, and increased rhythmicity.

Methods
Methods are currently available at https://doi.org/10.1038/s41467-022-35535-4