Many sociolinguistic studies have found that minority groups are not participating in the sound changes characteristic of the majority community. This study, however, presents evidence that /u/-fronting, a sound change observable in California Anglo speakers, is found in the minority Mexican-American community as well, among speakers of Chicano English. Furthermore, while a high percentage of variation research has focused on correlating sociolinguistic variables with traditional social factors (age, gender, and social class being the most common), the results of this research underscore the need to analyze variation within the context of those social categories that are of particular significance to the specific community being studied, as well as the importance of incorporating interactions among social factors into a sociolinguistic analysis.
In a world sample (N = 60), the indigenous languages of tropical and subtropical climates in contrast to the languages spoken in temperate and cold zones manifested high levels of sonority. High sonority in phonetic segments, as found for example in vowels (versus consonants), increases the carrying power of speech sounds and, hence, audibility at a distance. We assume that in the course of daily activities, the speakers in warm/hot climates (a) are often outdoors due to equable ambient temperatures, (b) thereby frequently transmit messages distally, and (c) transmit such messages relatively intelligibly due to the acoustic and functional advantages of high sonority. Our conceptual model is similar to that of population biology, where there are well-known correlations between climate and somatic variables, and where it is assumed that communicative modalities and behaviors are selected or designed for success in specific habitats. We also take up possible alternative hypotheses and consider directions for future research.
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