text: Yo, check it out, I got a story to tell,
  'Bout bidirectional changes that make movements excel.
  But establishing the cause, man, it's such a task,
  Linking synaptic plasticity and movements fast.
  
  We wondered 'bout mGluR1 in the game,
  Participating in cerebellar LTD, bringing the fame.
  Is it necessary for the VOR to learn both ways?
  Let's dive deep and see what the research says.
  
  Injected mGluR1 agonist, (S)-DHPG,
  Or antagonist YM 298198, let's see the spree.
  Alert cats, flocculus, motor learning in play,
  Let's see how the VOR's gain will sway.
  
  With YM 298198, gain-up and gain-down,
  The VOR's gain decreased, man, that's the crown.
  But (S)-DHPG? It boosted gain-up's might,
  No significant effect on gain-down, that's right.
  
  These results, they support the theory in town,
  Gain-up learning, cerebellar LTD, profound.
  But gain-down's different, another mechanism to find,
  Without mGluR1, cerebellar LTP's the kind.
  
  So there you have it, the story's complete,
  Bidirectional changes and how they compete.
  In the absence of mGluR1, one-way's the game,
  Learning restricted, but it's never the same.