Resumen en español

A protocol for the measurement of physiological and emotional responses to sound stimuli is presented. The sounds used in the study were created by comparing different methods and possible bandwidths. These sounds correspond to white noise filtered in 3 central frequencies, to know, 125 Hz, 500Hz, and 3150Hz, with a variable bandwidth based on 1/3 octaves. additionally, spatial information was given to the sounds by convolving them with a simulated binaural impulse response. Two experiments were conducted. The first one consisted of 3 sounds created at different sound pressure levels, between 50 dB and 80 dB in 6 steps. It was found that both valence and arousal changed as the level increased, the first one decreasing, and the last one increasing, showing a possible relation between elicited emotions from a sound and its sound pressure level. The second experiment presented both image and sound simultaneously. The sound corresponded to the same described above, at a fixed level of 65dB. The images were two, one with a positive semantic content, and the other with a negative one. Both images were taken from the IAPS (International Affective Picture System). Responses were measured with the self assessment manikin SAM and Noldus FaceReader technology. The results obtained with the SAM were not conclusive, probably due to sample size, experiment design and other factors. The results obtained with the FaceReader showed clear reactions from participants to the audiovisual.