They also show positive relationships between SV2A levels and verbal memory in post-traumatic stress disorder (PTSD), major depression, and cannabis use disorder (D’Souza et al., 2021;Holmes et al., 2019), along with negative relationships with response time on a visual attention task in individuals with a psychiatric comorbidity (Asch et al., 2022). Here, SV2A is linked to major depressive disorder.