Exploratory behavior in the light/dark box before the 4-wk protocol (Pre) was comparable among groups. During the Pre light/dark box assessment, PV-Arch (n = 34), PV-ChR2 (n = 27), PV-PV (n = 15), and no-laser (n = 25) mice scored similarly in various measures of exploratory behavior including time to first light-side entry (latency), number of light-side entries, duration of light-side exploration, and total vertical rears (verticals).