LESION OF DIFFERENT REGIONS OF THE CEREBRAL HEMISPHERES. 521 
SECTION IV. 
Lesions of the Frontal Lobes. 
Experiment 19 (Plate 25, fig. 56). 
In this animal, which was very vivacious and intelligent, the frontal lobes were 
exposed on both sides. Faradic stimulation of the base of the first and second 
frontal convolution on the left side was found to cause movement of the head and 
eyes to the right. This region, viz. : the base of the superior and middle frontal 
convolutions, ivas then seared, with the cautery, first on the left, and then on the right 
side. On the animal recovering consciousness, which it did after the dressing of the 
wound was finished, it sprawled with all four limbs, and opened both eyes. The 
pupils were contractile to light, but the right was somewhat smaller than the left. 
Half an hour after the operation the animal was able to sit up, which it did holding 
the head bent on the chest. There was no distortion of the head. An hour after the 
operation it was able to move about freely and to climb up the bars of the cage, hand 
over hand. It started at sounds but did not turn the head or eyes, excejit perhaps 
slightly to the right, when sounds were made close to each ear respectively. 
The head shook when the animal stooped, and there appeared to be a want of power 
to turn the head without the body as a whole. 
An hour and a half after the operation the animal wandered about restlessly, and 
when it sat still the head oscillated—nutation. Sight was unimpared. The slightest 
touch on any part of the head, neck, or other part of the body caused the animal to 
put its hand to the spot, showing unimpaired tactile sensibility. It started to sounds 
made to the right or left, but did not look round as other Monkeys do under similar 
circumstances. In turning it described a considerable circle, evidently from defective 
mobility of the head and eyes laterally. 
Next day there was some oedema of the eyelids so that the eyes could not be seen 
distinctly. Tapping close to the ears caused them to twitch, but the animal did not 
look round, except perhaps slightly to the right. Tactile sensibility of the head and 
neck was as acute as elsewhere, the animal always putting its hand up to the place 
touched. 
The animal was very dull and listless, paying no attention to its surroundings, or 
occasionally running about in an aimless manner. 
On the fourth day the condition was essentially the same. But to-day it was seen 
to turn its head both to the right and left without turning its body as a whole. The 
eyeballs were not fixed but moved about in various directions. The movements of the 
limbs were in every respect perfect. 
There were at this time indications that the wound was not aseptic, which was 
attributed to the fact that the anterior extremity of the wound was not sufficiently 
protected by the dressings. 
MDCCCLXXXIV. 3 X 
