This paper presents arguments for considering the anterior cingulate cortex as a critical structure in intentional communication. Different facets of intentionality are discussed in relationship to this neural structure. The macrostructural and microstructural characteristics of ACC are proposed to sustain the uniqueness of its architecture, as an overlap region of cognitive, affective and motor components. At the functional level, roles played by this region in communication include social bonding in mammals, control of vocalization in humans, semantic and syntactic processing, and (...) initiation of speech. The involvement of the anterior cingulate cortex in social cognition is suggested where, for infants, joint attention skills are considered both prerequisites of social cognition and prelinguistic communication acts. Since the intentional dimension of gestural communication seems to be connected to a region previously equipped for vocalization, ACC might well be a starting point for linguistic communication. (shrink)

This paper presents arguments for considering the anterior cingulate cortex as a critical structure in intentional communication. Different facets of intentionality are discussed in relationship to this neural structure. The macrostructural and microstructural characteristics of ACC are proposed to sustain the uniqueness of its architecture, as an overlap region of cognitive, affective and motor components. At the functional level, roles played by this region in communication include social bonding in mammals, control of vocalization in humans, semantic and syntactic processing, and (...) initiation of speech. The involvement of the anterior cingulate cortex in social cognition is suggested where, for infants, joint attention skills are considered both prerequisites of social cognition and prelinguistic communication acts. Since the intentional dimension of gestural communication seems to be connected to a region previously equipped for vocalization, ACC might well be a starting point for linguistic communication. (shrink)

The article analyzes the neural and functional grounding of language skills as well as their emergence in hominid evolution, hypothesizing stages leading from abilities known to exist in monkeys and apes and presumed to exist in our hominid ancestors right through to modern spoken and signed languages. The starting point is the observation that both premotor area F5 in monkeys and Broca's area in humans contain a “mirror system” active for both execution and observation of manual actions, and that F5 (...) and Broca's area are homologous brain regions. This grounded the mirror system hypothesis of Rizzolatti and Arbib (1998) which offers the mirror system for grasping as a key neural “missing link” between the abilities of our nonhuman ancestors of 20 million years ago and modern human language, with manual gestures rather than a system for vocal communication providing the initial seed for this evolutionary process. The present article, however, goes “beyond the mirror” to offer hypotheses on evolutionary changes within and outside the mirror systems which may have occurred to equip Homo sapiens with a language-ready brain. Crucial to the early stages of this progression is the mirror system for grasping and its extension to permit imitation. Imitation is seen as evolving via a so-called simple system such as that found in chimpanzees (which allows imitation of complex “object-oriented” sequences but only as the result of extensive practice) to a so-called complex system found in humans (which allows rapid imitation even of complex sequences, under appropriate conditions) which supports pantomime. This is hypothesized to have provided the substrate for the development of protosign, a combinatorially open repertoire of manual gestures, which then provides the scaffolding for the emergence of protospeech (which thus owes little to nonhuman vocalizations), with protosign and protospeech then developing in an expanding spiral. It is argued that these stages involve biological evolution of both brain and body. By contrast, it is argued that the progression from protosign and protospeech to languages with full-blown syntax and compositional semantics was a historical phenomenon in the development of Homo sapiens, involving few if any further biological changes. Key Words: gestures; hominids; language evolution; mirror system; neurolinguistics; primates; protolanguage; sign language; speech; vocalization. (shrink)

Many people have argued that the evolution of the human language faculty cannot be explained by Darwinian natural selection. Chomsky and Gould have suggested that language may have evolved as the by-product of selection for other abilities or as a consequence of as-yet unknown laws of growth and form. Others have argued that a biological specialization for grammar is incompatible with every tenet of Darwinian theory – that it shows no genetic variation, could not exist in any intermediate forms, confers (...) no selective advantage, and would require more evolutionary time and genomic space than is available. We examine these arguments and show that they depend on inaccurate assumptions about biology or language or both. Evolutionary theory offers clear criteria for when a trait should be attributed to natural selection: complex design for some function, and the absence of alternative processes capable of explaining such complexity. Human language meets these criteria: Grammar is a complex mechanism tailored to the transmission of propositional structures through a serial interface. Autonomous and arbitrary grammatical phenomena have been offered as counterexamples to the position that language is an adaptation, but this reasoning is unsound: Communication protocols depend on arbitrary conventions that are adaptive as long as they are shared. Consequently, language acquisition in the child should systematically differ from language evolution in the species, and attempts to analogize them are misleading. Reviewing other arguments and data, we conclude that there is every reason to believe that a specialization for grammar evolved by a conventional neo-Darwinian process. (shrink)

Alexandra Maryanski's cladistic analysis of the last common ancestor to humans and apes reveals biological propensities in hominoids for autonomy, individualism, and weak-tie formation. The evolution of emotional capacities in humans, and the neuroanatomical bases for these capacities, are viewed as representing one of the many compensatory mechanisms for overcoming the low sociality contained in humans’ape ancestry. Speculation on the selection forces involved in hominids’growing capacity to use complex arrays of emotions for mobilizing energy, attuning, sanctioning, moral coding, exchanging and (...) decision-making is conducted with an eye towards redirecting micro-level theorizing in sociology. (shrink)