a, Schematic view of dorsal skull. Crosses mark the location of photoactivation with non-thermal laser. Off-target sites were chosen for their lack of meningeal vasculature. b, Locomotor activity one week following artificial cerebrospinal fluid (aCSF) and targeted photoablation, or Visudyne and off-target photoactivation. Mice were injected with 1 ug IL-1β or saline intraperitoneally 1 h before repeated open field assessment (n = 8 mice per group, 2 outliers removed in aCSF – IL-1b by ROUT Q = 0.5%). Data presented as mean ± s.e.m. b, Three-way ANOVA. Data in b resulted from a single experiment.