An Event-Related Potential Study on the Effects of Cannabis on Emotion Processing.

Also over parieto-occipital sites, an interaction by task by hemisphere approaching significance specified this P3 difference in users to be present over left sites for implicit, t (62) = 3.289, p = .002, d = .70, and explicit, t (67) = 3.251, p = .002, d = .72, but not empathic processing, t (68) = 2.046, p = .045, d = .51; while right sites showed no group differences (implicit: t (68) = 1.622, p = .109, d = .40, explicit: t (68) = 2.283, p = .026, d = -.40, empathic: t (68) = 2.192, p = .032, d = .55).

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However, there was a trend suggesting smaller P3 for neutral compared to happy expressions, t (69) = 2.322, p = .023, and also a smaller P3 for happy compared to angry expressions, t (69) = -1.328, p = .008, while no other comparisons approached significance.

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P3 effects did not reach statistical significance however there was a trend towards a greater P3 response for empathic responses to negative emotions compared to positive and neutral emotions in both groups.

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We also see a decrease in the P3 in emotion processing related to frequency of cannabis use with our data showing statistical trends nearing significance.

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