Characteristics of learning and memory impairment induced by Δ9-tetrahydrocannabinol in rats

Kenichi Mishima, Nobuaki Egashira, Nobue Hirosawa, Megumi Fujii, Yoshiaka Matsumoto, Katsunori Iwasaki, Michihiro Fujiwara

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74 Citations (Scopus)


We investigated the characteristics of Δ9-tetrahydrocannabinol (THC)-induced impairment of learning and memory using an 8-arm radial maze task, a water maze, a visual discrimination task with 2 figures and a passive avoidance test in rats. THC (6 mg/kg, i.p.) impaired spatial memory in the standard task of the 8-arm radial maze. THC (4 - 6 mg/kg, i.p.) selectively impaired working memory in a reference and working memory task of the 8-arm radial maze. Even at a dose of 10 mg/kg, THC did not impair spatial memory in the water maze. In addition, THC at a dose of 6 mg/kg, which had inhibitory effects in the 8-arm radial maze, did not affect performance in the visual discrimination task. These results indicate that at low doses (2 - 6 mg/kg), THC may not produce visual function abnormalities. THC impaired retrieval (6 mg/kg, i.p.) as well as acquisition (10 mg/kg, i.p.) in the passive avoidance test. The consolidation process was also impaired by i.c.v. injection (100 μg), but not i.p. injection (6 - 10 mg/kg) of THC. These results suggest that THC-induced impairment of spatial memory is based on the selective impairment of working memory through its effects on acquisition and retrieval processes.

Original languageEnglish
Pages (from-to)297-308
Number of pages12
JournalJapanese Journal of Pharmacology
Issue number4
Publication statusPublished - 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Pharmacology


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