Texture discrimination: You know denim is denim no matter how quickly you run your finger over it. You know silk is silk. Cotton is cotton. Rubber is rubber, no matter what speed you feel it with.
Combine this with the analogy to auditory system. If speed = pitch, and texture = timbre, THEN that explains the STABILITY OF INSTRUMENTS: We know a tuba is a tuba, a violin a violin, a piano a piano, because texture is timbre and timbre is texture and timbre is the characteristic texture of a musical instrument — or a voice, etc. It’s how the “object-ness” of a texture or timbre property remains intact DESPITE speed changes. It just shinks or grows but keeps the same ‘fingerprint’ of a tuba or ‘fingerprint’ of a silk texture.
Speed invariance of tactile texture perception
NEW & NOTEWORTHY Our brain forms stable representations of objects regardless of viewpoint, a phenomenon known as invariance that has been described in several sensory modalities. Here, we explore invariance in the sense of touch and show that the tactile perception of texture does not depend on scanning speed. This perceptual constancy implies neural mechanisms that extract information about texture from the response of nerve fibers such that the resulting neural representation is stable across speeds.