[nkurz]

Your summary is accurate, but I'm not sure why they chose to measure what they did. Rather than matching "full pathname" to 4 identifiers that are not the same (due to the significance of the underscore), it seems to me more appropriate to ask the subjects to match "full_pathname" to "full_pathname".

I consider the underscore and capitalization as part of the identifier, and _want_ to be able to distinguish the (most likely) typo "full pathname" from the desired identifier. Trying their example, most of my time was spent rescanning to find "none of the above", then rereading the directions.

Suggested alternative that I think would be a better study:

Which of the following is the same as "fullPathname":

  1) "fullpathname"
  2) "fullpathname"
  3) "FullPathname"
  4) "fullPathname"
  5) None of the above

Which of the above is the same as "full_pathname":

  1) "Full_Pathname"
  2) "Full Pathname"
  3) "full_pathname"
  4) "full pathname"
  5) None of the above