Journal article Open Access

Antigravity Hills are Visual Illusions

Bressan, Paola; Garlaschelli, Luigi; Barracano, Monica

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Bressan, Paola</dc:creator>
  <dc:creator>Garlaschelli, Luigi</dc:creator>
  <dc:creator>Barracano, Monica</dc:creator>
  <dc:description>Antigravity hills, also known as spook hills or magnetic hills, are natural places where cars put into neutral are seen to move uphill on a slightly sloping road, apparently defying the law of gravity. We show that these effects, popularly attributed to gravitational anomalies, are in fact visual illusions. We re-created all the known types of antigravity spots in our laboratory using tabletop models; the number of visible stretches of road, their slant, and the height of the visible horizon were systematically varied in four experiments. We conclude that antigravity-hill effects follow from a misperception of the eye level relative to gravity, caused by the presence of either contextual inclines or a false horizon line.</dc:description>
  <dc:source>Psychological Science 14(5) 441-449</dc:source>
  <dc:title>Antigravity Hills are Visual Illusions</dc:title>
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