Search results
Results From The WOW.Com Content Network
Temporal light artefacts (TLAs) are undesired effects in the visual perception of a human observer induced by temporal light modulations. Two well-known examples of such unwanted effects are flicker and stroboscopic effect. Flicker is a directly visible light modulation at relatively low frequencies (< 80 Hz) and small intensity modulation levels.
The March of Progress, [1] [2] [3] originally titled The Road to Homo Sapiens, is an illustration that presents 25 million years of human evolution. It was created for the Early Man volume of the Life Nature Library , published in 1965, and drawn by the artist Rudolph Zallinger .
The lower layers of the cave were later dated to 92,000 years ago, [28] and a series of hearths, several human bodies, flint artifacts (side scrapers, disc cores, and points [29]), animal bones (gazelle, horse, fallow deer, wild ox, and rhinoceros [29]), a collection of sea shells, lumps of red ochre, and an incised cortical flake were found. [28]
Up to about 80 Hertz or the flicker fusion threshold it is called visible flicker. From about 80 Hertz to 2000 Hertz it is called the stroboscopic effect (this article). Overlapping in frequency, but from 80 Hertz up to about 6500 Hertz a third effect exists called the phantom array effect or the ghosting effect , an optical phenomenon caused ...
The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period.
The site is important for many reasons, including the degree of preservation of ancient land surfaces, the impressive total extent of the palaeolandscape beyond the quarries (over 26 km wide), its huge quantity of well-preserved animal bones, its numerous flint artifacts, and its hominin fossils that are among some of the most ancient found yet in Europe.
According to Dubois, evolution occurred by leaps, and the ancestors of humanity had doubled their brain-to-body ratio on each leap. [35] To prove that Java Man was the "missing link" between apes and humans, he therefore had to show that its brain-to-body ratio was double that of apes and half that of humans.
Homo habilis (lit. 'handy man') is an extinct species of archaic human from the Early Pleistocene of East and South Africa about 2.4 million years ago to 1.4 million years ago ().