MOTOR FUNCTIONS OF CEREBRAL CORTEX OF CAT 



215 



would tend to make the movement more constant in its nature. 

 It was unable, in the strength used, either to initiate movements 

 of its own or to maintain activities initiated by direct stimula- 

 tion of the motor cortex. 



Examples of the myograms obtained by the above given 

 methods of stimulation of the motor and extra-motor cortex, are 

 presented in figures 63, 64, 65, 66, 67, 68, and 69. 



67 



FIGS. 63, 64, 65, 66, 67, 68, and 69. Curves showing the effects of stimulating 

 a "motor" point and the simultaneous or successive stimulation of a point 

 within the so-called "extra-motor" region. The figures have been reproduced 

 from tracings of the kymograph records. The broad black parts of the lower 

 two lines of each figure show the time of application of the stimulus to the motor 

 area (indicated by m) and to the extra motor region (indicated by em). For 

 description of the results see the text. 



The extra-motor regions investigated with regard to the 

 effect of applying a stimulus to a point within them simultane- 

 ously with the application of a similar stimulus to some point 

 on the motor cortex were those areas lying internal to the ante- 

 rior half of the main limb of the lateral fissure and external to 

 the ansate fissure in cat 36, and a similar location on the brain of 



