Muscimol (Mus, cat. G019–5 Mg) and rabbit polyclonal anti-c-fos (cat. HPA018531) were obtained from Sigma (St. Louis, MO, USA). Mouse monoclonal anti-c-fos (cat. Sc8047) and GAPDH (cat. Sc-69778) were obtained from Santa Cruz (Santa Cruz, CA, USA). Rabbit polyclonal anti-parvalbumin antibody (cat. bs-1299R) was purchased from Bioss (Bioss technology company, Beijing, China). Based on the sequences retrieved from a gene bank, Mouse zif268 (accession: NM007913) and arc (accession: NM001276684) primers were designed and produced by Takara Biotechnological Company (Takara Biotech, Co., Ltd., Dalian, China). Kits (cat. 9108) for total RNA extraction were purchased from Takara Biotechnological Company (Takara Biotech, Co., Ltd., Dalian, China). SYBR Green PCR Master Kits (cat. A6001) were purchased from promega (Promega Corporation, USA).