Why does Vista report that my Windows account not being in Administrators Role?

Under Windows Vista, when I check whether my current user account is in Administrators role, I am getting a negative, as shown in the following picture.

Can anyone tell me why I am not in the Administrators role? When I do the check if I am in "Debugger Users" role, I am getting "True"

In Windows Vista, your account doesn't have the Administrator role unless you've elevated to that level through User Account Control.

My understanding is that you effectively have two user accounts -- one normal level, one administrator level -- with UAC mediating the switch between the two.