The Badass Personalities of People Who Like Being Alone
psychologytoday.com
psychologytoday.com
Those two scales (extraversion and sociability) measure similar things so it is odd that they did not produce consistent findings.
You don't say?
As an aside, alone time is one reason I really love working remotely.
Sometimes though I am wondering what's wrong with me. Because obviously my experience and largely positive emotions about being alone are radically different from almost everybody else.