Send to

Choose Destination
Eur J Clin Invest. 2018 May;48(5):e12920. doi: 10.1111/eci.12920. Epub 2018 Apr 2.

Biphasic effects of THC in memory and cognition.

Author information

Department of Environmental Health Sciences, University of Massachusetts, Amherst, MA, USA.
Laboratorio de Biologia, Escuela Preparatoria Regional de Autlán, Universidad de Guadalajara, Jalisco, México.


A generally undesired effect of cannabis smoking is a reversible disruption of short-term memory induced by delta-9-tetrahydrocannabinol (THC), the primary psychoactive component of cannabis. However, this paradigm has been recently challenged by a group of scientists who have shown that THC is also able to improve neurological function in old animals when chronically administered at low concentrations. Moreover, recent studies demonstrated that THC paradoxically promotes hippocampal neurogenesis, prevents neurodegenerative processes occurring in animal models of Alzheimer's disease, protects from inflammation-induced cognitive damage and restores memory and cognitive function in old mice. With the aim to reconcile these seemingly contradictory facts, this work will show that such paradox can be explained within the framework of hormesis, defined as a biphasic dose-response.


Alzheimer's disease; biphasic dose response; cannabis; delta-9-tetrahydrocannabinol; hormesis; neuroprotection

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center