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5th-cent. theories about sound fall into two groups. Most though not all non-Pythagorean Presocratics were concerned primarily with the process of hearing (see especially Theophr. Sens.; cf. also Hippocr. De victu 1. 8 and 15 on hearing and voice). The Pythagoreans opened a musical perspective, beginning from observed correspondences between pitch-relations and the relative lengths of pipes or strings. They showed that the correspondences hold quite generally, through demonstrations using other sound-sources (see e.g. DK 18. 12, 13; texts attributing ‘experiments’ to Pythagoras himself are unreliable). The resulting hypothesis that pitch itself is a quantitative variable prompted deeper enquiries, beginning in the 4th cent., into the physical nature of sound, its causes, transmission, and attributes, as well as the process of hearing.
The Greeks did not recognise acoustics as a separate science; the issues were studied in other contexts, mainly by philosophers interested in sense-perception, by biologists and medical writers, and above all by harmonic theorists.
D. W. R. Ridgway
Acquarossa, a plateau 6 km. (3 ½ mi.) north of Viterbo, is the site of a small and anonymous *Etruscan centre in the territory of *Caere. Excavation (1966–78) of its component areas—including the monumental complex in zone F, variously defined as a ‘palace’, a ‘regia’, or a ‘sacred area’ (with a temple)—has combined with contemporary work at *Poggio Civitate to focus attention on early Etruscan building techniques, domestic and public architecture, town planning, and non-funerary religious practice. Like Poggio Civitate, Acquarossa has yielded copious architectural *terracottas. The most important category, previously unknown or unrecognized, is that of the *orientalizing cut-out acroteria used on two-slope roofs between c.650/600 and c.575. They have no Greek models or counterparts, and clearly follow schemes derived from the strong indigenous tradition of exuberantly decorated roof-tops documented by the impasto hut-urns used as cinerary receptacles (but representing real huts) in Etruria and Latium between the 10th and 8th centuries.
Katie Wagner and David Barner
Human experience of color results from a complex interplay of perceptual and linguistic systems. At the lowest level of perception, the human visual system transforms the visible light portion of the electromagnetic spectrum into a rich, continuous three-dimensional experience of color. Despite our ability to perceptually discriminate millions of different color shades, most languages categorize color into a number of discrete color categories. While the meanings of color words are constrained by perception, perception does not fully define them. Once color words are acquired, they may in turn influence our memory and processing speed for color, although it is unlikely that language influences the lowest levels of color perception.
One approach to examining the relationship between perception and language in forming our experience of color is to study children as they acquire color language. Children produce color words in speech for many months before acquiring adult meanings for color words. Research in this area has focused on whether children’s difficulties stem from (a) an inability to identify color properties as a likely candidate for word meanings, or alternatively (b) inductive learning of language-specific color word boundaries. Lending plausibility to the first account, there is evidence that children more readily attend to object traits like shape, rather than color, as likely candidates for word meanings. However, recent evidence has found that children have meanings for some color words before they begin to produce them in speech, indicating that in fact, they may be able to successfully identify color as a candidate for word meaning early in the color word learning process. There is also evidence that prelinguistic infants, like adults, perceive color categorically. While these perceptual categories likely constrain the meanings that children consider, they cannot fully define color word meanings because languages vary in both the number and location of color word boundaries. Recent evidence suggests that the delay in color word acquisition primarily stems from an inductive process of refining these boundaries.
Arthur Geoffrey Woodhead and R. J. A. Wilson
Acrae (near mod. Palazzolo Acreide), founded by *Syracuse in 663
Acraephnium (mod. Karditza), city in NE *Boeotia, located above a small bay of Lake *Copais; perhaps the Homeric Arne. Fortifications and cemeteries have been excavated, the latter revealing splendid examples of early painted pottery. It entered the Boeotian Confederacy in 447