Oddly Wired
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eye contact

You avoid eye contact to manage your own arousal.

Eye contact is a high-arousal stimulus that people regulate to manage their cognitive and emotional load.

Too much eye contact can be overwhelming, leading you to look away as a way to regulate your internal stimulation. This is not necessarily about shyness, but a strategy to keep your brain from being over-stimulated during interaction.

You look away to protect your focus.

Where this comes from

Study
Argyle and Cook, 1976, Gaze and Mutual Gaze
What the check found
The claim accurately captures the core premise of the Equilibrium Theory as presented in Argyle and Cook (1976), though the 'high-arousal' mechanism has faced mixed empirical support in replications.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.