Anticonvulsants/therapeutic use; Astrocytoma/complications; Astrocytoma/diagnosis; Brain Neoplasms/complications; Brain Neoplasms/diagnosis; Piloerection; Seizures/etiology; Aged; Amygdala/pathology; Amygdala/physiopathology; Astrocytoma/drug therapy; Astrocytoma/pathology; Astrocytoma/physiopathology; Brain Neoplasms/drug therapy; Brain Neoplasms/pathology; Brain Neoplasms/physiopathology; Electroencephalography; Hippocampus/pathology; Hippocampus/physiopathology; Humans; Levetiracetam; Magnetic Resonance Imaging; Male; Piracetam/analogs & derivatives; Piracetam/therapeutic use; Seizures/pathology; Seizures/physiopathology; Temporal Lobe/pathology; Temporal Lobe/physiopathology; Valproic Acid/therapeutic use