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In Human Computer Interaction, appropriate feedback is especially important when an error occurs. This work compares implications for user's psychological reactance and acceptance of two different types of error and their representations through feedback. Reactance and acceptance levels were measured after presenting feedback that allows a conclusion on the cause of an occurred error and feedback that fails to do so. It was found that reactance levels were significantly higher and acceptance levels significantly lower in the latter case. Suggestions for appropriate system design are discussed.

Intelligent Personal Assistants (IPAs) have become a mainstream product and often show a high level of variance in terms of their interaction philosophy. For example, Google's Now has no personality at all, whereas personality plays a strong part in the advertisement of Apple's Siri. We have assessed the personality profile of users and their preference for either Apple's Siri, Google's Now or Microsoft's Cortana, based on attractiveness and psychological state reactance. Analysis revealed how the preference for an IPA depends on a person's character traits. Preferences of individual traits are discussed and average profiles for devotees of different IPAs are given. The results can be used to recommend IPAs specifically to a users' personality profile. The work concludes with a number of recommendations for the design of IPAs to address specific personality traits of users.

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