On each trial in an experiment, a researcher exposes participants to either a pleasant or an unpleasant priming picture for several milliseconds. She then shows participants a picture of a person's face and asks the participants to rate the person's likeability. The researcher is MOST likely studying:

subliminal differences

Explanation:

The meaning of subliminal is something that is difficult to feel and explain; but may be remembered due to constant repetition.

Subliminal messages are stimuli that lie below our threshold of conscious awareness. 

Subliminal differences manipulate our minds and modify our behaviors.

Importantly, research on action priming has shown that subliminal stimuli can trigger only actions a receiver of the message plans to perform.

texas governor sam houston opposed secession, but was unable to prevent it. in this speech, given prior to lincoln's election, he presents the argument that slavery would be safer within the united states than outside of it. it was a prescient argument, and one held by several other southern leaders.

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