Objective To investigate whether the GABAB receptors in the hippocampal dentate gyrus( DG) are were involved in spatial learning and memory impairments in vascular dementia( VD). Methods Totally 24 SD rats were randomly divided into sham- operated,VD and GABAB receptor antagonist groups,and the VD rat model was established by permanent bilateral carotid occlusion. The extracellular concentration of GABA in DG was determined by in vivo microdialysis and HPLC,and spatial learning and memory was assessed by Mo...