Fig. 2. The effect of spatial enrichment on brain size. The effect of spatial enrichment on brain size. Individuals housed under standard non-enriched (S) conditions had significantly larger brains than individuals housed in spatially enriched (E) environments (P=0.046). Residual values are from regressions of log brain size on log body length. Plotted values are mean±s.e.m. n=31 (EM), 18 (EF), 34 (SM), 10 (SF). M, male; F, female. Mischa P. Turschwell, and Craig R. White Biology Open 2016;bio.015024 © 2016. Published by The Company of Biologists Ltd