The sequelae of craniocerebral trauma (CCT) were studied using a model based on severe (3–4 atm) lateral hydrodynamic percussion (liquid-percussive brain injury) in male Sprague–Dawley rats. With the aim of detecting the symptoms of anxiety states, the rats' behavior was assessed in the dark-light box and the elevated plus maze test; sleep impairments were detected by recording the electrocorticogram (ECoG) before trauma and during the first week after trauma. The results provided evidence of the post-CCT development of signs of an anxiety state, accompanied by decreases in the proportion of REM sleep and decreases in the amplitude and frequency of the ECoG during this phase.
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