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The Emancipation Proclamation represented a turning point in Lincoln's own thinking.
Absolute Threshold
The minimum stimulus intensity required to detect a particular stimulus 50% of the time.
Adaptation Threshold
The limit to which an organism or a system can adapt to changes in conditions or stimuli.
Difference Threshold
The smallest amount of change in a stimulus that can be detected as different from the original stimulus.
Subliminal Threshold
The level below which a stimulus is not consciously detected but can still influence thoughts, feelings, or actions.
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