Extrapolation reactions following destruction of the dorsal cortex of the turtle forebrain

: Turtles Emys orbicularis (14 individuals) with ablated middle-anterior parts of the forebrain dorsal cortex proved unable to solve a problem calling for extrapolating the direction of the movement of a food stimulus. Intact turtles (11 individuals) and those (six individuals) which underwent control operations (including ablation of the posterior part of the dorsal cortex) correctly solved the problem, beginning with its first presentations. A conclusion has been drawn on the significant part played by the middle-anterior parts of the forebrain dorsal cortex coinciding in turtles with the convergence zone of different afferent systems, in the integration of a complex form of behaviour linked with the pursuit of and search for a food object after its disappearance from the animal's visual field.