Canadian researchers, Catharine Winstanley and Mason Silveria, revealed in a  research that rats under the effect of Tetrahydrocannainol (THC) are slothful. From the two researchers, former is a professor in the department of psychology associated with UBC and the latter is a PhD student.

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Prior to the research, 29 healthy adult male rats were selected. The researchers trained those rats to perform a playful activity in an arcade- training was the significant part of the research. In the arcade, rats had two options to finish the game. Concluding the game through an easy option would reward them with one sugar treat and with two for completing the game through a hard line.

Catharine Winstanley, senior author of the study and an associate professor in UBC’s department of psychology, said in a statement:

“This was surprising, as it had been suggested that high concentrations of CBD could modulate or reduce the negative effects of THC. Unfortunately, that did not appear to be the case.”

In the game, for the easy line a light was illuminated in its cage for a single second. To earn sugar treat, rats had to hit the light within five seconds with their nose. In the harder line, the light was illuminated only for 0.2 seconds.

When rats were not under the effect of the drug, they opted the harder task, but when given THC they become slacker and accepted only one sugar treat. The finding shows that only THC present in marijuana is responsible for the mental indolent excluding rest of the chemicals and compounds of marijuana.

It was evident that fusion of THC with cannobidiol terminates the effect of THC, but this research appeared to cancel out the previous evidences.

The research is expected as a great step in strengthening laws related to THC and weeds like marijuana.


  1. Lazy Rats? or Lazy Research?

    I offer an alternative explanation for the study’s findings, based on previous research in this area. Studies show that higher doses of THC can suppress both appetite and the desire for sugar in rats. Perhaps this is why hungry rats treated with THC were “unmotivated” to go after the higher effort/higher sugar reward, or why some of the THC treated rats made no attempt to participate at all. Please read my post for more details and references:

    Dr. Ethan Russo’s comments about this study are also included in my post, with his permission.

    Dr. Russo is the Medical Director of PHYTECS, a board-certified neurologist, psychopharmacology researcher, and former Senior Medical Advisor to GW Pharmaceuticals. Ethan played a critical role in developing the whole plant cannabis extracts Sativex® (nabiximols) and Epidiolex®.