The constant minimum percentage principle is a perceptual principle that states that two stimuli must differ by a constant percentage rather than a constant amount in order to be perceived as different. This means that the perceived difference between two stimuli depends on the ratio of their intensities, rather than on the actual difference in their values.
Related terms
Weber's Law: Weber's law is related to the constant minimum percentage principle and states that there is a constant proportional relationship between the magnitude of physical stimuli and the perception of their differences. In simpler terms, as stimulus intensity increases, so does the amount required for noticeable differences.
The difference threshold refers to the smallest detectable difference between two stimuli. It is also known as just noticeable difference (JND) and relates closely to Weber's law and the constant minimum percentage principle.
Signal detection theory explores how we make decisions under conditions of uncertainty when presented with both meaningful signals (stimuli) and background noise. It takes into account factors such as sensitivity to stimuli and decision-making biases.