1911.] 



Motor Localisation in the Brain of the Gibbon. 



G9 



20. Distinct flexion of hip and knee, flexion of toes. 

 20 (again). Flexion of knee, flexion of hip. 



21. Mouth. 



22. Retraction of tongue. 



22 (repeated). Same results. {\ cm. of cortex for tongue.) 

 1000 K.U.— 



23. Eyeballs turned inwards and downwards. 



24. Upward movement of eyeball. 



23 (again). Eyeballs turned downwards and slightly inwards. 

 23 (repeated). Same results. 



1250 K.U.- 



Eyes. No result. 



Bipolar stimulation :■ — 



9 cm. No result. 



8 cm. Mouth moves. 



Unipolar stimulation as before : — 

 1250 K.U.— 



22a. Movement of tongue (protrusion of opposite side). 

 226 (at lowest point). Movement of tip of tongue. 



25. Here a very slight movement of tongue tip was obtained from just behind inferior 



extremity of central fissure, tip of tongue deviated to opposite side (but see 

 below). 



Unipolar stimulation: small electrode : — 

 800 K.U.— 



22a. In front of fissure, deviations of tongue as before. 

 25. And various other points behind fissure, nothing. 

 1250 K.U.— 



22a -b. Well-marked protrusion and deviation to opposite side. 

 22o-6 (again). -Protrusion, obtained repeatedly. 

 22a-6 (again). Eetraction. 

 25. Nothing. 



25 (again). Nothing (repeated). 



(Results obtained above from 25 with large electrode attributed to diffusion.) 



Right Hemisphere. 

 Unipolar stimulation : coarser electrode : — 

 800 K.U.— 



1. Extension of wrist, opening of fingers. 



2. Extension of elbow and wrist, flexion of fingers. 



3. Flexion of fingers, chiefly index, abduction of thumb. 



4. Movements of wrist, tendency to pronation. 



5. Extension of fingers, hallux, wrist ; some abduction and tendency to pronation. 



6. Eye-movements, outward and upward. 

 900 K.U.— 



7. Extension of wrist. 

 1000 K.U.— 



3 (again). Flexion of fingers and wrist (clenching of hand). 



{Interval of 20 minutes ; stimulation then resumed.) 



