text: Yo, check it out, I got a study to discuss
  Gonna evaluate some relationships, so adjust
  Quantitative EEG, that's qEEG, you see
  Lookin' at cognitive disturbance, PD, and the motor stage, gee
  
  32 PD patients, average age 67.2, hold up
  26 normal subjects, average age 68.4, yup
  We did a neurological evaluation, no doubt
  Modified Hoehn and Yahr scale, that's what we're about
  
  CERAD neuropsychological battery, Portuguese version, hey
  Mini-mental Status Examination, we don't play
  Clinical Dementia Rating, that's what we need
  Plus EEG analysis, absolute and relative band amplitude indeed
  
  Now let's compare the groups, listen closely
  Three PD groups: dementia, mild cognitive impairment, no cognitive disturbances, mostly
  And the control group, gotta have a baseline
  Checkin' out the qEEG, see if there's a sign
  
  No significant differences with the control, that's true
  But abnormalities in qEEG, we gotta pursue
  Mild cognitive impairment and dementia, they're related
  Increased theta amplitude, it's stated
  
  Posterior theta and delta, they're the ones
  Amplitude goin' up, especially in dementia, son
  So, qEEG, it could be a tool
  Assessin' cognitive aspects in PD, that's cool