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The US-Soviet thaw resulted in:
Just-noticeable Difference
The smallest difference in stimulus intensity that can be detected by a sensory system.
Sensory Adaptation
The method through which sensory detectors decrease their sensitivity to unchanging stimuli over a period.
Absolute Threshold
The minimum intensity of a stimulus that one can perceive, marking the boundary between non-detection and detection of a stimulus.
Weber's Law
A principle in psychology that states the smallest change in a stimulus, such as weight or brightness, that can be detected is a constant proportion of the stimulus level.