Use the laws of logarithms to simplify the expression. 
Definitions:
Context Effects
The influence of environmental factors on one's perception or understanding of a stimulus.
Perceptual Set
A readiness to perceive or interpret stimuli in a particular way based on expectations, experiences, emotions, and culture.
Weber's Law
A principle stating that the smallest change in a physical stimulus that can be detected is a constant proportion of the stimulus level.
Masking Stimulus
A stimulus used to interfere with the perception of another stimulus, often used in research to study attention and perception processes.
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