After a first date it's normal to wonder if those warm, fuzzy feelings are reciprocated. Now, experts are one step closer to an app that will tell you if they're'just not that into you'. Researchers have trained a computer - using data from wearable technology that measures respiration, heart rates and perspiration – to identify the type of conversation two people are having. In experiments with 16 pairs of participants, it was able to differentiate four different conversation scenarios with as much as 75 per cent accuracy. Lead author Iman Chatterjee, from the University of Cincinnati, said the technology could one day give you honest feedback about yourself or your date.

Worried your Valentine's date hasn't gone well? An app could soon tell whether a second one is on the cards… or if they simply found you boring. AI can now work out how well dates have gone by measuring how much each person is sweating, how quick they're breathing, and how fast their hearts are beating. The more these synchronise, the more likely the two people involved are compatible, according to the study by the University of Cincinnati. Scientists behind the technology are looking at developing it into an app that can give romantics'honest feedback' about their dates – or themselves.

We're often told that copying body language and mannerisms on a first date are surefire signs that your date is interested in you. But according to researchers in the Netherlands, in-sync sweating and heart rates are much better indicators of a romantic attraction. In a blind date setting, experts fitted male and female participants with eye-tracking glasses and other devices to measure behavioural and physiological signals. They found no significant link between physical attraction and copying body language -- either smiling, laughing, direct eye contact, head nods or hand gestures. A stronger indicator of attraction was'physiological synchrony' -- in-sync sweating and heart rates -- which they say is'a precursor of deeper emotional understanding'.