1. A method comprising: identifying one or more current contextual attributes of a current context of a user; setting a current value of a first stored interestedness threshold based at least in part on the one or more identified current contextual attributes; obtaining one or more current physiological measurements of the user; deriving a first interestedness score based at least in part on the one or more obtained current physiological measurements; comparing the derived first interestedness score to the current value of the first stored interestedness threshold; initiating video recording of a scene by a wearable computing device when the derived first interestedness score exceeds the current value of the first stored interestedness threshold; deriving a second interestedness score; comparing the second interestedness score to a second threshold; and terminating the video recording by the wearable computing device when the second interestedness score does not exceed the second threshold.