[Verse 1] Deep in V4, where the magic unfolds Colors stay constant as the story gets told When shadows shift and lighting does change This neural region keeps hues in their range Not raw cone signals, but perceived display Zeki found neurons that work this way Track surface color through illuminant shift V4's the master of this perceptual gift [Chorus] V4's the bridge in the visual stream Color constancy and curvature's dream Between simple edges and objects complete Where attention reshapes what neurons will meet Intermediate features, the middle ground zone Where visual processing finds its backbone [Verse 2] Curvature coding at angular spots Pasupathy Connor mapped these neural plots Contour fragments dance in receptive fields Concentric spirals and radial wheels Not Cartesian gratings but patterns that bend Shape parts assembly from beginning to end Between V1's edges and IT's whole face V4 builds features in this crucial space [Chorus] V4's the bridge in the visual stream Color constancy and curvature's dream Between simple edges and objects complete Where attention reshapes what neurons will meet Intermediate features, the middle ground zone Where visual processing finds its backbone [Verse 3] Moran Desimone revealed the key Two stimuli competing for what cells see But when attention focuses on just one The ignored stimulus becomes undone Receptive fields reshape their boundaries tight Responding as if there's only one sight Spatial and feature attention converge V4's where selective focus will emerge [Verse 4] From retinal maps to topographic space V4 maintains each visual place Foveal magnification still holds true While complex computations filter through Multiple maps for color, form, and more Parallel channels from V2's door Integration happens in this neural hub Where vision's puzzle pieces start to rub [Bridge] When V4's damaged, achromatopsia appears Color perception simply disappears World turns to grayscale, vibrance is lost Without V4's work, that's the visual cost From illuminant correction to curvature code Attention's spotlight on this neural road [Chorus] V4's the bridge in the visual stream Color constancy and curvature's dream Between simple edges and objects complete Where attention reshapes what neurons will meet Intermediate features, the middle ground zone Where visual processing finds its backbone [Outro] Richer responses, harder to define Mid-level processing in the visual design V4 stands guard at the crucial divide Where simple meets complex, side by side [Chorus] V4's the bridge in the visual stream Color constancy and curvature's dream Between simple edges and objects complete Where attention reshapes what neurons will meet Intermediate features, the middle ground zone Where visual processing finds its backbone
← V2 - second visual area | Inferotemporal cortex (IT) - object identity →