['Contextual fear memory depends on the hippocampus, but the role of unilateral hippocampus in this type of memory remains unclear.', 'Herein, pharmacological inactivation or excitotoxic lesions were used to study the role of unilateral hippocampus in the stages of contextual fear memory.', 'The pharmacological experiments revealed that compared with the control groups, unilateral hippocampal blockade did not impair 1-day recent memory following learning, whereas bilateral hippocampal blockade significantly impaired this memory. The lesion experiments showed that compared with the control groups, the formed contextual fear memory was retained for 7\xa0days and that 30-day remote memory was markedly reduced in unilateral hippocampal lesion groups.'] Does unilateral hippocampal inactivation or lesion selectively impair remote contextual fear memory?