Behavior: the way in which someone conducts oneself.
According to Cognitive Behavioral Therapy (CBT) thoughts, feelings and behaviors are strongly interconnected.
For example:
Thought: “I don’t know anyone here and I’m so awkward.”
Feeling: anxiety/fear
Behavior: not engaging in conversations with others and wanting to leave event early
Which reinforces the belief that “I am awkward.” On and on the cycle goes, unless interrupted by a new belief/thought, feeling and/or experience.
EMDR is another way of disrupting this cycle, however it goes about it in a different way - a bottom-up approach (body based) versus a top-down approach (cognitive/intellectual).
Regardless of the mode of therapy, it's important to explore what is behind the behavior. It is in that awareness that change can start to happen.
https://www.merriam-webster.com/dictionary/behavior
https://cogbtherapy.com/cbt-model-of-emotions
https://www.emdria.org/blog/integrating-emdr-therapy-with-cognitive-behavioral-therapy-cbt/