Which of the crucial features does NOT represent a highly similar across all sense modalities?

A) conversion of a physical stimulus into a neural signal
B) sensory coding
C) neurochemical processing
D) sensory quality

Neurochemical processing is not a feature that is highly similar across all sense modalities. This is because the chemicals that are involved in processing sensory information can differ between modalities. For example, the chemicals involved in olfactory processing are different from those involved in visual processing. The other choices, conversion of a physical stimulus into a neural signal, sensory coding, and sensory quality, are all features that are common across all sense modalities.