Prefrontal cortex and putamen grey matter alterations in cannabis and tobacco users.

Background: Previous magnetic resonance imaging studies in regular cannabis users report altered grey matter volume (GMV) in brain regions, including the prefrontal cortex (PFC), putamen and hippocampus. However, most studies have tended to recruit recreational users with high levels of cannabis use, and have not controlled for the possible confounding effects of tobacco use. We attempt to address these limitations in the present study.

It takes me back: The mnemonic time-travel effect.

Given the links between motion and temporal thinking, it is surprising that no studies have examined the possibility that transporting participants back mentally towards the time of encoding could improve memory. Six experiments investigated whether backward motion would promote recall relative to forward motion or no-motion conditions. Participants saw a video of a staged crime (Experiments 1, 3 and 5), a word list (Experiments 2 and 4) or a set of pictures (Experiment 6).