[Verse 1]
Two rivers run from the back of your eye,
one dips down low, one climbs the sky,
the ventral path names what you behold,
temporal lobe keeps the story told,
the dorsal path doesn't care for the name,
it's racing up high for the reaching game,
ninety-two, Milner and Goodale drew the line,
two streams, one brain, running separate in time.
[Chorus]
Ventral's the "what," dorsal's the "how,"
one tells the tale, one moves right now,
temporal knows the name of the thing,
parietal's the hand that gives the swing,
fast and unconscious, dorsal won't wait,
feeding the premotor, sealing the fate,
two streams, one brain, learn it and know,
vision for seeing, vision for go.
[Verse 2]
Watch the fingers as they open wide,
scaling to size before thought takes a side,
by sixty, seventy percent through the reach,
the aperture's already set to teach,
PMd and PMv, the grasping crew,
dorsal whispers what the hand should do,
no conscious debate, no asking "why,"
the hand gets smarter faster than the eye.
[Chorus]
Ventral's the "what," dorsal's the "how,"
one tells the tale, one moves right now,
temporal knows the name of the thing,
parietal's the hand that gives the swing,
fast and unconscious, dorsal won't wait,
feeding the premotor, sealing the fate,
two streams, one brain, learn it and know,
vision for seeing, vision for go.
[Verse 3]
Meet DF, her ventral road went dim,
carbon fumes had stolen the picture from within,
form agnosia, that's the name they gave,
she can't call the angle, no matter how brave,
ask her the tilt, she shrugs, she guesses wrong,
but hand her a card, and her body hums the song,
she posts it clean, aligned, precise, no fail,
her dorsal stream still reads the hidden trail.
[Bridge]
Parietal's the switchboard, wired tight,
sending its signal straight to PMv's site,
the grasping circuit, hand-shaping chain,
dorsal stream's quiet, unconscious domain,
remember the chapters, remember the thread,
parietal to premotor, straight through the head.
[Chorus]
Ventral's the "what," dorsal's the "how,"
one tells the tale, one moves right now,
temporal knows the name of the thing,
parietal's the hand that gives the swing,
fast and unconscious, dorsal won't wait,
feeding the premotor, sealing the fate,
two streams, one brain, learn it and know,
vision for seeing, vision for go.
[Outro]
Ventral tells stories, dorsal takes aim,
DF's quiet eyes, but her hand knows the game,
two streams forever, flowing apart,
"what" in the temple, "how" in the parietal part,
Milner and Goodale handed us the key,
vision for knowing, and vision for action, finally free.