Auto scans following a virus def. update: Part 2

Yesterday I posted a question as to why my computer is running more quick scans than I have scheduled. A couple of respondents said that NIS 2013 automatically runs a Quick Scan following each download of new virus definitions. Upon further monitoring, my computer doesn't seem to be doing that. So, I used Norton Live Chat and the well-intentioned Norton representative in India (no doubt) said that Norton will not run a Quick Scan after each download of new virus definitions but will, on some preset internal Norton schedule, periodically run Quick Scans while my computer is idle. Is that true? She wasn't too convincing. My computer is off at night and only on during the day while I am using it.

 

Do any of you know what the correct info is here?

 

Thanks for the help.