The unconditioned response when people are learning a language are their responses to the actual physical stimuli. So for instance, seeing an actual snake may be scary for people as opposed to the word "snake."

Classical Conditioning's Unconditioned Response in Relational Frame Theory

Language may start out as a neutral stimulus when people are initially learning how to pronounce words. Initially, they may perceive language as just sounds.

New Mexico Highlands University

In a sense, langague can be viewed as a neutral stimulus. After all, language is just comprised of sounds. However, humans have been conditioned to see meaning in words. That may be why words can have a profound impact on people's emotional responses.

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