n. The ability to watch or listen carefully to more than one thing at a time.
2001
Though she claims to disdain the academic life, she seems to fall back on jargon such as 'polyattentiveness' and 'plebianized' when she doesn't have anything of significance to say.
1983 (earliest)
Or we may cultivate a skill John Cage calls "polyattentiveness" — the simultaneous apprehension of two or more unrelated phenomena.