Who emphasized that we repress anxiety-arousing memories?

Freud.

Explanation:

Sigmund Freud was a neurologist and founder of the psychoanalysis, who created the concept of "the subconscious".

This subconscious concept is a fundamental part of Freud's theory and it is based on the fact that our mind represses memories but they actually remain in the mind (so they are in the subconscious mind) and can reappear (on the conscious mind) under some circumstances.

One of the memories that Freud considered were object of repression are the anxiety-arousing memories, since they generate us anxiety, the mind represses them so we can continue with our lives but they can reappear under some circumstances like when we are exposed to an stimuli related to them or when we're in psychoanalysis.

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