A method, apparatus and computer program are provided. The method comprises: obtaining, from at least one detector of a wearable device, a first detection of at least one bio-signal from at least one user； controlling a user output device of an electronic device to initiate a user alert, after obtaining the first detection of the at least one bio-signal, wherein the electronic device is different from the wearable device； obtaining, from the at least one detector of the wearable device, a second detection of the at least one bio-signal from the at least one user, wherein the second detection is performed after initiating the user alert； and processing the first detection of the at least one bio-signal and the second detection of the at least one bio-signal to determine whether one or more changes in the at least one bio-signal pass a significance test.
