22. A non-transitory computer-readable media storing computer-executable instructions that, when executed by a processor, cause the processor to perform acts comprising: receiving an audio signal comprising a representation of an utterance; monitoring for an occurrence of an event; at least partly in response to identifying the occurrence of the event, determining a similarity score for the utterance based on a comparison between the representation of the utterance and a representation of a defined word or phrase; modifying the similarity score; modifying a similarity acceptance criterion for a period of time; and transitioning an electronic device from a first state to a second state based at least in part on a determination that the modified similarity score satisfies the modified similarity acceptance criterion.
22. A non-transitory computer-readable media storing computer-executable instructions that, when executed by a processor, cause the processor to perform acts comprising: receiving an audio signal comprising a representation of an utterance; monitoring for an occurrence of an event; at least partly in response to identifying the occurrence of the event, determining a similarity score for the utterance based on a comparison between the representation of the utterance and a representation of a defined word or phrase; modifying the similarity score; modifying a similarity acceptance criterion for a period of time; and transitioning an electronic device from a first state to a second state based at least in part on a determination that the modified similarity score satisfies the modified similarity acceptance criterion. 24. The non-transitory computer-readable media as recited in claim 22 , wherein the electronic device operates with additional functionality in the second state than when in the first state.