Cannabis products labeled indica and sativa had different effects on cognitive effort in rats | Research

The takeaway

Oral cannabis oil marketed as indica reduced rats’ willingness to exert cognitive effort for larger rewards, while sativa-labeled oil with identical THC and CBD content did not, despite producing similar brain THC levels.

Cannabis pharmacology researchers, cognitive neuroscientists, cannabis product regulators

Same THC/CBD content, different cognitive effort effects between indica and sativa

What the researchers found

Both cannabis products (matched for THC and CBD content) slowed response times at higher doses, but only the indica-labeled oil at 10 mg/kg THC reduced the proportion of trials where rats chose high-effort/high-reward options. Ex vivo analysis confirmed comparable brain THC levels between the two products, suggesting minor cannabinoids or terpenes drove the behavioral difference.

Why it matters

The indica/sativa distinction is often dismissed as marketing, but this controlled study shows that products with identical THC and CBD levels can produce different cognitive effects, suggesting other plant compounds matter.

The numbers in context

Highest dose: 10 mg/kg THC; only indica at this dose reduced high-effort choices; repeated medium dose (3 mg/kg THC) of either product did not influence choice; comparable brain THC levels confirmed ex vivo

How the study worked

Male Long-Evans rats received acute oral administration of two commercially available cannabis extracts (marketed as C. indica or C. sativa, matched for THC and CBD content) at multiple doses. Cognitive effort was measured using a task where rats chose between low-effort/low-reward and high-effort/high-reward options.

What this study cannot tell us

Only two commercial products tested. Male rats only. Oral administration may not reflect smoked or vaporized use. Product composition beyond THC/CBD was not fully characterized.

How to read the evidence

Controlled animal study with verified brain THC levels, but only two products tested in male rats with oral administration.

When this study was published

Published 2023

The bigger picture

This research supports the idea that cannabis effects cannot be predicted from THC and CBD content alone, reinforcing calls for more comprehensive chemical profiling of cannabis products.

Questions still open

Which specific minor cannabinoids or terpenes explain the indica-sativa difference in cognitive effort? Would these effects replicate with other product pairs?

Common questions

Do indica and sativa actually have different effects?

In this rat study, cannabis oils labeled indica and sativa with identical THC and CBD content produced different effects on cognitive effort, with only indica reducing willingness to work harder for bigger rewards.

If THC levels were the same, why were effects different?

Brain THC levels were confirmed to be comparable between the two products, suggesting that minor cannabinoids, terpenes, or other plant compounds were responsible for the behavioral differences.

Read the original research

Divergent effects of oral cannabis oil extracts marketed as C. indica or C. sativa on exertion of cognitive effort in rats.

Behavioral neuroscience, 137(1), 41-51

View on PubMed ↗Publisher’s paper ↗

Citation

Brodie, Hannah G; Hathaway, Brett A; Li, Andrew; Baglot, Samantha L; Kaur, Sukhbir; Hill, Matthew N; Winstanley, Catharine A. (2023). Divergent effects of oral cannabis oil extracts marketed as C. indica or C. sativa on exertion of cognitive effort in rats.. Behavioral neuroscience, 137(1), 41-51. https://doi.org/10.1037/bne0000535