How can I tell if she's lying?

(McGill University) For people who suffer from diseases like Alzheimer's or Parkinson's,conditions such as Autism spectrum disorders, any form of non-literal speech such as sarcasm, teasing or 'white lies' can be very confusing. A new video inventory of examples of these forms of indirect speech developed at McGill should help in the diagnosis and clinical testing of those with disorders of this kind.