text: Yo, the pharmacological basis
  Of perceptual learning, it's hard to chase
  But check it, we induced that learning vibe
  With Hebbian coactivation, skin alive
  
  On the tip of the right index finger, we played
  In humans, that's how the game was made
  Placebo in effect, but hold up tight
  Tactile two-point discrimination took flight
  
  On the coactivated finger, it improved, no doubt
  But the left index finger, it was left out
  N-methyl-D-aspartate-receptor blocker came through
  Blocked the augmentation, that's what it do
  
  But wait, amphetamine doubled the game
  Boosting the improvement, it's never the same
  No drug effects found on the left index side
  Only the right finger could ride this high tide
  
  Cortical reorganization, let's peep that scene
  Mapped somatosensory evoked potentials, know what I mean?
  Linear correlation with pharmacological sway
  Modulating discrimination thresholds in a major way
  
  Perceptual learning and cortical shifts
  Controlled by mechanisms, that's the real gift
  Known to mediate and modulate synaptic plasticity
  Basic mechanisms, shaping our reality