They are high in protein, have complex carbs, lots of micronutrients and can be whipped up into a wide variety of delicious dishes. It is no wonder that beans are the staple food of so many cultures around the world.
Background[ edit ] Although related to the more general problem of the origin of languagethe evolution of distinctively human speech capacities has become a distinct and in many ways separate area of scientific research.
Speech is in this sense optional, although it is the default modality for language.
Places of articulation passive and active: Sub-apical Uncontroversially, monkeys, apes and humans, like many other animals, have evolved specialised mechanisms for producing sound for purposes of social communication. The angular gyrus is represented in orange, supramarginal gyrus is represented in yellow, Broca's area is represented in blue, Wernicke's area is represented in green and the primary auditory cortex is represented in pink.
The term modality means the chosen representational format for encoding and transmitting information. A striking feature of language is that it is modality-independent. Should an impaired child be prevented from hearing or producing sound, its innate capacity to master a language may equally find expression in signing.
Sign languages of the deaf are independently invented and have all the major properties of spoken language except for the modality of transmission. The Faculty of Language: Caption reads "Chimpanzee disappointed and sulky. Drawn from life by Mr. Animal communication systems routinely combine visible with audible properties and effects, but not one is modality-independent.
No vocally impaired whale, dolphin or songbird, for example, could express its song repertoire equally in visual display. Indeed, in the case of animal communication, message and modality are not capable of being disentangled. Whatever message is being conveyed stems from intrinsic properties of the signal.
Modality independence should not be confused with the ordinary phenomenon of multimodality.
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The human linguistic property of "modality independence" is conceptually distinct from this. It allows the speaker to encode the informational content of a message in a single channel, while switching between channels as necessary.
Whichever modality is chosen, it can reliably transmit the full message content without external assistance of any kind. When talking on the telephone, for example, any accompanying facial or manual gestures, however natural to the speaker, are not strictly necessary.
When typing or manually signing, conversely, there's no need to add sounds. Evolution of the speech organs[ edit ] Human vocal tract Speaking is the default modality for language in all cultures. The speech organs, everyone agrees, evolved in the first instance not for speech but for more basic bodily functions such as feeding and breathing.
Nonhuman primates have broadly similar organs, but with different neural controls. When an ape is not eating, fine motor control over its tongue is deactivated. Since this applies to mammals in general, Homo sapiens is exceptional in harnessing mechanisms designed for respiration and ingestion to the radically different requirements of articulate speech.
Phoneticians agree that the tongue is the most important speech articulator, followed by the lips. A natural language can be viewed as a particular way of using the tongue to express thought.
The human tongue has an unusual shape. In most mammals, it's a long, flat structure contained largely within the mouth.
It is attached at the rear to the hyoid bonesituated below oral level in the pharynx. In humans, the tongue has an almost circular sagittal midline contour, much of it lying vertically down an extended pharynxwhere it is attached to a hyoid bone in a lowered position.
Partly as a result of this, the horizontal inside-the-mouth and vertical down-the-throat tubes forming the supralaryngeal vocal tract SVT are almost equal in length whereas in other species, the vertical section is shorter.
As we move our jaws up and down, the tongue can vary the cross-sectional area of each tube independently by about This past semester at MIT I took a really wonderful class called “Feminist Political Thought” which had a very open ended essay assignment.
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