The existence of synesthesia demonstrate that sensation and perception are independent of one another through a perceptual anomaly.
Perceptual anomaly in which a sensory stimulus associated with one perceptual modality automatically triggers another insuppressible sensory experience which is usually, but not always, associated with a different perceptual modality as when musical tones elicit the visual experience of colors.
In conclusion, we can conclude that the correct answer is as given above.
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