The INTERSPEECH 2015 Computational Paralinguistics Challenge addresses three different problems for the first time in research competition under well-defined conditions: the estimation of the degree of nativeness, the neurological state of patients with Parkinson's condition, and the eating conditions of speakers, i.e., whether and which food type they are eating in a seven-class problem. In this paper, we describe these sub-challenges, their conditions, and the baseline feature extraction and classifiers, as provided to the participants.