Poor performance when unattended. Is this person's attitude or it is natural?

It depends to the people and to their character, there are some that they really do their attitude and pretending busy once the superior is around those people are the so called the - AIDS people As If Doing Something. But still there some people who have initiative and done their job even you left them unattended and those people who have that qualities are natural and deserve to hire... To find an asset employees is along process that needs a trial and error test to find out if they really deserve.