Figure 5
From: Effect of ablated hippocampal neurogenesis on the formation and extinction of contextual fear memory
High gamma-ray irradiation blocked the formation but not the extinction of contextual fear memory with a 2-week interval between retrieval and extinction training. (A) Experimental procedures. (B) Percent freezing in gamma-ray-irradiated groups on the retrieval day. 20 Gy-irradiated group showed less freezing than sham or 10 Gy (*, p < 0.05). (C) Percent freezing was presented with value relative to it on the retrieval day. R; retrieval.