“I suspect that when you have to make hard admissions decisions, you tend to make them in favor of the people about whom you have the most information, and that will somewhat favor extroverts who are a little more likely to have gotten more information about themselves in front of the admissions staff – through many channels, including interviews, essays, the reports of teachers and counselors, and accomplishments with ECs.”
. . . and, beginning this upcoming admissions cycle at UChicago, optional video profiles. Who will be more likely to submit those?