Here's an example of an adapted test from thew questionnaire
airto.bmap.ucla.edu/BMCweb/Private/3TLab/LabNotes/edinburgh.html

Here's a paper on it and another one for comparison:
www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=963874 6&dopt=Abstract