Öhman and his colleagues found that fear responses to snake stimuli could be conditioned:

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Öhman and his colleagues demonstrated that fear responses could be conditioned to snake stimuli even when the conditioned stimulus (CS), in this case, the snake image, was presented below the threshold of conscious detection. This suggests that the brain can process fear-evoking stimuli and condition fear responses to them without the need for the stimuli to be consciously recognized.

ÖHman and His Colleagues Found That Fear Responses to Snake