PSYCH 2E03 Lecture Notes - Lecture 5: Stimulus Modality, Detection Theory, Power Law
16 Sep 2016
School
Department
Course
Professor
Document Summary
Psych 2e03 lecture 5 measuring perception. As stimulus intensity increases, need larger difference in threshold to notice difference (weber"s law) Fechner stated that even when a greater stimulus is needed, that difference you notice them, the magnitude you pick up on is the same. S. s. stevens was confident you could directly measure sensation: exact relationship between stimulus and sensation could be attained. Relationship between stimulus and sensation can be directly measured by subjects: subjects ratings were consistent with the power law. Different sensory experiences are related to stimulus intensity by a particular exponent. All sensory modalities even though they are measured in same way have unique power laws. Very different magnitudes of power law gives rise to different sorts of responses. Brightness curve, perception grows rapidly with increasing light intensity, but then flattens out. Power law = 1 means exact relationship with intensity.
