Global broadcasting of local fractal fluctuations in a bodywide distributed system supports perception via effortful touch

Abstract A long history of research has pointed to the importance of fractal fluctuations in physiology, but so far, the physiological evidence of fractal fluctuations has been piecemeal and without clues to bodywide integration. What remains unknown is how fractal fluctuations might interact across the body and how those interactions might support the coordination of goal-directed behaviors. We demonstrate that a complex interplay of fractality in mechanical fluctuations across the body supports a more accurate perception of heaviness and length of occluded handheld objects via effortful touch in blindfolded individuals. For a given participant, the flow of fractal fluctuation through the body indexes the flow of perceptual information used to derive perceptual judgments. Effortful touch depends on compression of high-dimensional flux of mechanotransduction into low-dimensional perceptual information specifying properties of hefted occluded objects. These patterns in the waxing and waning of fluctuations across disparate anatomical locations provide novel insights into the form of this compression.