A technology company is developing a lie detector1 app for smartphones that could be used by parents, teachers - and internet daters.
The app measures blood flow in the face to assess whether or not you are telling the truth. Its developers say that it could be used for daters wanting to see if somebody really is interested in them.
Parents could use it on their children to see if they are lying and teachers could work out which of their pupils are truthful2.
The app is being developed by Toronto startup NuraLogix and the software is called Transdermal Optical Imaging.
The idea is that different human emotions create different facial blood flow patterns that we have no control over. These patterns change if we are telling the truth or telling a lie.
Using footage from the smartphone camera, the software will see the changes in skin colour and compare them to standardized3 results.
A study from last year found that anger was associated with more blood flow and redness whilst sadness was associated with less of both.
Developmental neuroscientist Kang Lee, who has been researching the field for 20 years, said that the lie detector test will let you find out the truth 'non-invasively, and remotely, and sometimes it can be covertly4'.