A notion is an idea or belief about something. In this context, the notion refers to the belief that all humans experience sensations in the same way.
Related terms
Individual differences: Variations in how people perceive or experience sensations due to factors such as genetics, personal history, or cultural background.
Sensory thresholds: The minimum amount of stimulation needed for a person to detect a sensory stimulus. Different individuals may have different thresholds for various senses.
A condition where stimulation of one sense leads to automatic experiences in another sense. For example, someone with synesthesia may perceive numbers as having specific colors.