Drawing on the notion of musical intervals, recent studies have demonstrated the presence of frequency ratios within human vocalisation. Methodologically, these studies have addressed human vocalisation at a single-individual level. In the present study, we asked whether patterns such as musical intervals are also detected among the voices of people engaging in a conversation as an emerging interpersonal phenomenon. A total of 56 participants were randomly paired and assigned to either a control or a low-trust condition. Frequency ratios were generated by juxtaposing nonlocal fundamental frequency (F0) emissions from two people engaged in each individual dyadic conversation. Differences were found among conditions, both in terms of interval distribution and accuracy. This result supports the idea that psychological dispositions modulate the musical intervals generated between participants through mutual real-time vocal accommodation. These results underscore the socio-intentional dimension of music in vocal pitch interplay.

This research consists in carrying a study about the use of polymeric fibers as reinforcement of adobe mortar plasters. Thus, different samples were made in a laboratory; one zero sample and others, which carried several fibers in different amounts. These were tested in a drilling press as to obtain the characteristics of their flexion and compression. With these results, a statistical and c o n t r a s t i v e a n a l y s i s w a s m a d e. The results allowed to show which fiber sample comply with the best characteristics after the adding of fibers and thus, create a behavior pattern for this material. It was established that the quality of a non structural element such as plasterundergone to flexion and compressionbecomes more effective with the adding of polymeric fibers.