[Verse 1] Deep in the thalamus, a gateway stands Six layers thick with neural strands The LGN sorts what your eyes have caught Before it reaches the cortex thought Center-surround fields still hold their ground No radical transforms to be found Just refining channels, keeping them clear As visual signals venture near [Chorus] One-two magno, three-four-five-six parvo Konio hides between the layers we know Contra-ipsi-contra, eyes alternate their flow One-four-six from the other side go Two-three-five from your same side show LGN's the relay, organizing the show [Verse 2] Layers one and two house the giants inside Magnocellular cells with nowhere to hide Parasol ganglions feed them well Fast transient signals they love to tell Achromatic visions, high contrast scenes Motion and coarse forms, they're processing machines Big cells for big picture, movement and more While smaller layers wait for their chore [Chorus] One-two magno, three-four-five-six parvo Konio hides between the layers we know Contra-ipsi-contra, eyes alternate their flow One-four-six from the other side go Two-three-five from your same side show LGN's the relay, organizing the show [Verse 3] Three through six belong to parvocellular crew Midget cells whisper what they once knew Sustained responses, red-green debate Fine spatial details they calculate Color opponents locked in their dance Giving small features their fighting chance Four layers strong for precision and hue While mysteries lurk in sublayers too [Verse 4] From retinal maps to cortical zones The LGN preserves what topology owns Retinotopic order stays intact Visual fields precisely mapped and tracked Feedback descending from cortex above Fine-tunes the signals with push and shove Not just a relay, but active gate Controlling which messages reach their fate [Bridge] Koniocellular secrets tucked away Blue-yellow channels have their say Scientists mapping what else they do In thin sublayers, functions still new Each eye alone, no fusion yet That combination cortex will beget [Chorus] One-two magno, three-four-five-six parvo Konio hides between the layers we know Contra-ipsi-contra, eyes alternate their flow One-four-six from the other side go Two-three-five from your same side show LGN's the relay, organizing the show [Outro] Gateway keeper, thalamic throne Parallel channels, each stands alone Till cortex calls and the merger begins That's where the real integration wins
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