[Verse 1]
Nineteen ninety-seven, Snyder's careful eye
Split the parietal map before the body moved a limb
MIP folds into V6A, that's where the reaching lives
LIP next door just watches where the eyeballs want to swim
Same target, same banana, same decision in the room
But the neurons cast their votes before the hand or eye consume
That's the intention hypothesis, written clean and clear
Plan the reach, plan the glance — two separate drummers, same frontier
[Chorus]
P-R-R, reach for me
V-6-A, grab what you see
LIP's got the eyes on a leash
PRR's the hand reaching out for the peach
Plan it first, move it after
Parietal cortex writing the chapter
Reach and gaze, two distinct refrains
Same old target, different lanes
[Verse 2]
Galletti and Fattori opened up the drawer
Found wrist-orientation cells and grip-type coders galore
V6A talks to V6, borrows vision from behind
Ships it forward to premotor F2, dorso-dorsal line
It's the highway for your hand before you even know you'll grab
Action-ready, vision-fed, no detour, and no gab
Cui and Andersen then asked which arm will take the call
PRR reflects effector choice — left hand, right hand, standing tall
[Chorus]
P-R-R, reach for me
V-6-A, grab what you see
LIP's got the eyes on a leash
PRR's the hand reaching out for the peach
Plan it first, move it after
Parietal cortex writing the chapter
Reach and gaze, two distinct refrains
Same old target, different lanes
[Verse 3]
Hwang and Hauschild, Wilke, Andersen, two-thousand-twelve
Switched off PRR and watched the reaching shelf
Fingers fumbled, overshot, the hand forgot the spot
Mimicking the misreach that Bálint's patients got
That's optic ataxia — vision fine but guidance lost
The bridge from eye to fingertip burned out, and what's the cost?
Connolly found the human twin, the cortex does the same
Cavina-Pratesi mapped the SPOC and gave it a name
[Bridge]
Prado showed the brain splits near from far
Central reach and peripheral reach don't share a single star
Pitzalis drew the human V6 upon the calcarine shore
Every patch, every pathway, teaching us some more
[Verse 4]
Now surgeons tap the signal, wire it to a limb of steel
PRR becomes the whisper that a robot hand can feel
From monkey cortex mapping to a prosthetic's gentle sway
The reaching circuit built in you still points the modern way
[Chorus]
P-R-R, reach for me
V-6-A, grab what you see
LIP's got the eyes on a leash
PRR's the hand reaching out for the peach
Plan it first, move it after
Parietal cortex writing the chapter
Reach and gaze, two distinct refrains
Same old target, different lanes
[Outro]
MIP, V6A, the hand knows where to go
LIP keeps the eyes in step, but the reach has its own glow
Two streams, one target, intention drawn in advance
PRR and V6A — the brain's own reaching dance