Tonic vs. Phasic Receptors: Key Differences in Sensory Adaptation
Tonic receptors fire continuously, giving a steady signal as long as the stimulus lasts. Phasic receptors fire intensely when the stimulus starts, then quickly fall silent even if the stimulus stays—this is sensory adaptation in action. People mix them up because both detect the same stimuli—pressure, light, smell—but “tonic” sounds like “tone” (constant) while “phasic”…