Archaeological evidence and linguistic evidence converge in support of an origin of Indo-European languages on the Pontic-Caspian steppes around 4,000 years BCE. The evidence is so strong that arguments in support of other hypotheses should be reexamined.

The origin of tone, also known as <i>tonogenesis</i>, has long been a topic of great interest in language evolution and human cognition studies. Several linguistic studies of tonal languages have proposed various hypotheses that tonal origin may be related to different changes of phonological structures. However, such hypotheses have not been quantitatively tested in an evolutionary framework. Here, we conducted phylogenetic comparative analyses to assess the likelihood of different hypotheses of tonogenetic mechanisms across 106 Sino-Tibetan languages, of which approximately 70% are tonal. Our results showed that the presence of tones has a strong phylogenetic pattern and that Proto-Sino-Tibetan languages were most likely non-tonal. Our findings identified that tonal origin was strongly associated with the evolution of specific phonological structures, such as the loss of syllable-final consonants and voice quality on vowels. Furthermore, we found that tonal origin probably did not influence the diversification rates of Sino-Tibetan languages. These findings enabled us to better understand that tone arose as a compensatory mechanism for the structural organization and evolution of languages.

<h4>Introduction</h4>This study investigates the Je language family and Macro-Je phylum, addressing a significant gap in previous research by applying quantitative methods to its classification.<h4>Dataset</h4>The study compares a subset of 303 concepts from 14 languages, primarily sourced from Swadesh lists and culturally relevant terms, providing a robust foundation for phylogenetic analysis.<h4>Methods</h4>Bayesian phylogenetic inference and NeighborNet methods were employed to analyze the dataset. These approaches enabled the reconstruction of evolutionary relationships within the Je family, facilitating the identification of language divergence patterns and their historical dynamics.<h4>Results</h4>The analysis reveals well-supported Northern, Central, and Southern subgroups within the Je family, demonstrating clear geographical clustering. The phylogenetic tree aligns with existing hypotheses while offering new insights into the family's structure.<h4>Discussion</h4>The findings were contextualized within pre-Columbian archaeological frameworks, drawing parallels between linguistic divergence and material culture. These connections support the hypothesis that the Je language family's development aligns with distinct cultural and geographical distributions observed in archaeological records.<h4>Conclusion and future directions</h4>This study affirms the genetic coherence of the Je family and highlights opportunities for future research, including the incorporation of non-Je languages in the Macro-Je phylum and expanded datasets to refine the understanding of this diverse linguistic group.

This entry focuses on proto‐languages and the various methods and models by which they are reconstructed. Beginning with general principles such as the tree model and the wave model, the entry delves into various problems related to the reconstructability and status of proto‐languages. The overview includes an introduction to three main methods of proto‐language reconstruction: the historical‐comparative (or comparative ), the diachronic typological (or typological ), and the computational phylogenetic (or phylogenetic ) models. The main principles and methodologies are described, also with an outlook to the development of these models over time. The entry also discusses how proto‐languages can be located in time and space, and the parameters according to which a spatial and temporal reconstruction should be evaluated. Toward the end, the entry gives a special introduction to the Eurasian linguistic area, including an overview of the reconstruction of the Indo‐European and Caucasian proto‐languages.

Historical linguistics aims at inferring the most likely language phylogenetic tree starting from information concerning the evolutionary relatedness of languages. The available information are typically lists of homologous (lexical, phonological, syntactic) features or characters for many different languages: a set of parallel corpora whose compilation represents a paramount achievement in linguistics. From this perspective the reconstruction of language trees is an example of inverse problems: starting from present, incomplete and often noisy, information, one aims at inferring the most like

Proto-Indo-European society is the reconstructed culture of Proto-Indo-Europeans, the ancient speakers of the Proto-Indo-European language, ancestor of Proto-Indo-European society is the reconstructed culture of Proto-Indo-Europeans, the ancient speakers of the Proto-Indo-European language, ancestor of all modern Indo-European languages. Historical linguistics combined with archaeological and genetic evidence have provided the current basis for understanding the culture and its people. The most widely accepted theory suggests that the culture eme Proto-Indo-European society is the reconstructed culture of Proto-Indo-Europeans, the ancient speakers of the Proto-Indo-European language, ancestor of all modern Indo-European languages. Historical linguistics combined with archaeological and genetic evidence have provided the current basis for understanding the culture and its people. The most widely accepted theory suggests that the culture emerged on the Pontic–Caspian steppe after 5000 BCE, a period known as the Chalcolithic, where smelted copper and stone tools were in use simultaneously. Proto-Indo-European speakers are considered to have been semi-nomadic, but domestication of cattle, first for ritual sacrifice and later for consumption, dairy production, and cereal cultivation, emerged as the culture shifted from herding and hunter-gatherer behaviours to farming. The social hierarchy included an upper class of priests, warriors and tribe chiefs and a lower class of commoners and slaves; patrilineality and patriarchy characteristics have been well-established. Trade, bolstered by access to wheeled wagons, connected Proto-Indo-European culture to others with archaeological and linguistic evidence supporting relations with Proto-Uralic peoples, Uruk, and Old European cultures.

Toltecs. Linguistic Reclassifications.— The science of linguistics may give the historian his oldest facts because the demonstration of kindred speech in sundered