On the results of research on the excitability of the posterior frontal lobe

According to Ferrier, the area of ​​the anterior frontal lobe (P. praefrontalis), located in front of the line, mentally drawn perpendicular to the front end of s. praecentralis, does not give any motor phenomena in case of irritation, which is confirmed by Horsley and Beefor, as well as other authors. Between this area and the anterior central furrow together with the mental continuation of it to s. longitudinalis is the area, irritation of which causes, according to Ferrier, open eyes, dilated pupils and movement of the eyes and head in the opposite direction. Horsley and Beefor, with the help of weak minimal irritations, divided this area into three separate centers, from which the upper, located closer to the inner cleft of the brain, moves the head in the opposite direction, the middle moves the head and eyes to the opposite side and the lower one turns only the eyes in the opposite direction. It should be borne in mind that these centers altogether occupy an area much larger than one Ferrier center.