﻿424 
  

  

  Dr. 
  D. 
  Ferrier 
  on 
  the 
  Brain 
  of 
  Monkeys, 
  

  

  Circle 
  Q^Ji 
  % 
  s 
  « 
  1 
  & 
  2, 
  including 
  the 
  superior 
  and 
  middle 
  frontal 
  con- 
  

   volution 
  from 
  the 
  antero-parietal 
  sulcus 
  (Huxley), 
  sulcus 
  praecentralis 
  

   (Ecker), 
  to 
  the 
  anterior 
  extremity 
  of 
  the 
  supero-frontal 
  sulcus. 
  

  

  The 
  results 
  of 
  stimulation 
  of 
  these 
  convolutions 
  were 
  always 
  so 
  uni- 
  

   form, 
  that 
  the 
  general 
  result 
  of 
  experimentation 
  in 
  ten 
  monkeys 
  may 
  be 
  

   stated 
  together. 
  The 
  results 
  were 
  : 
  — 
  

  

  Elevation 
  of 
  the 
  eyebrows 
  and 
  the 
  upper 
  eyelids, 
  turning 
  of 
  the 
  eyes 
  

   and 
  head 
  to 
  the 
  opposite 
  side, 
  and 
  great 
  dilatation 
  of 
  both 
  pupils. 
  

  

  Occasionally 
  on 
  stimulation 
  of 
  the 
  centre 
  for 
  the 
  forward 
  extension 
  of 
  

   the 
  hand 
  this 
  movement 
  of 
  the 
  eyes 
  and 
  head 
  was 
  called 
  into 
  play. 
  

  

  Inferior 
  frontal 
  convolution 
  (including 
  all 
  in 
  advance 
  of 
  the 
  sulcus 
  

   prsecentralis). 
  

  

  Stimulation 
  of 
  this 
  region 
  gave 
  no 
  results. 
  

  

  Antero-f 
  rontal 
  region 
  (including 
  all 
  in 
  advance 
  of 
  the 
  anterior 
  extremity 
  

   of 
  the 
  supero-frontal 
  sulcus, 
  and 
  indicated 
  sometimes 
  by 
  a 
  slight 
  sulcus 
  

   at 
  right 
  angles 
  to 
  the 
  median 
  fissure) 
  and 
  orbital 
  convolution. 
  

  

  These 
  regions 
  were 
  subjected 
  to 
  stimulation 
  in 
  four 
  cases, 
  viz. 
  I., 
  V., 
  

   VIII., 
  and 
  IX. 
  

  

  No 
  results 
  could 
  be 
  observed, 
  either 
  from 
  the 
  antero-frontal 
  or 
  orbital 
  

   regions. 
  

  

  In 
  a 
  later 
  experiment 
  (December 
  2) 
  on 
  another 
  monkey 
  it 
  was 
  found 
  

   that 
  stimulation 
  of 
  the 
  frontal 
  part 
  of 
  the 
  brain 
  caused 
  the 
  eyes 
  to 
  move 
  

   to 
  the 
  opposite 
  side. 
  This 
  was 
  found 
  to 
  be 
  the 
  case 
  with 
  irritation 
  of 
  

   both 
  right 
  and 
  left 
  hemispheres. 
  The 
  eyelids 
  were 
  not 
  always 
  opened, 
  

   however, 
  nor 
  was 
  dilatation 
  of 
  the 
  pupils 
  observed. 
  Sometimes 
  also 
  the 
  

   eyes 
  moved 
  upwards, 
  instead 
  of 
  to 
  the 
  opposite 
  side. 
  

  

  Irritation, 
  therefore, 
  of 
  this 
  region 
  gives 
  nothing 
  definite 
  as 
  to 
  their 
  

   function, 
  

  

  Angular 
  gyrus 
  (pli 
  courbe, 
  Gratiolet). 
  

  

  Circle 
  QL3) 
  and 
  figs. 
  1 
  & 
  2. 
  This 
  is 
  referred 
  to 
  as 
  being 
  com- 
  

   posed 
  of 
  an 
  ascending 
  or 
  anterior 
  and 
  a 
  descending 
  or 
  posterior 
  

   limb. 
  

  

  Eesults 
  of 
  stimulation 
  

  

  I. 
  Eyes 
  directed 
  upwards 
  and 
  to 
  the 
  right. 
  Some 
  oscillation 
  of 
  the 
  

  

  right 
  e} 
  r 
  eball 
  continued 
  after 
  the 
  Avithdrawal 
  of 
  the 
  electrodes. 
  

  

  On 
  longer-continued 
  stimulation 
  the 
  head 
  is 
  turned 
  to 
  the 
  

   right, 
  and 
  the 
  eyeballs 
  to 
  the 
  right 
  and 
  slightly 
  upwards. 
  

  

  II. 
  Not 
  explored. 
  

  

  Ascending 
  limb, 
  circle 
  

  

  