Fig. 1

a Object recognition at the 2-week time point. Sham-irradiated mice and those irradiated with ⁵⁶Fe ions (600 MeV) at 0.2 Gy showed object recognition and explored the novel object more than the familiar one but mice irradiated with either 0.1 Gy or 0.4 Gy did not. b Object recognition at the 20-week time point. All groups explored the novel object significantly more than the familiar one. N = 16 mice/dose. *p < 0.05; **p < 0.01 versus familiar object