Locating executive functions in fish brains
The telencephalon is the part of the brain responsible for executive functions in fish, according to an experimental study. Zegni Triki and colleagues used guppies (Poecilia reticulata) that had been selected over five generations to have smaller or larger telencephalons, resulting in a 10% size difference between “up selected” and “down selected” lines of fish. Total brain size was not significantly affected. The authors then presented 48 male fifth-generation fish from both lines with tests of cognitive flexibility, inhibitory control, and working memory—the three commonly accepted components ...













