Journal article Open Access

Antigravity Hills are Visual Illusions

Bressan, Paola; Garlaschelli, Luigi; Barracano, Monica

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  "DOI": "10.1111/1467-9280.02451", 
  "container_title": "Psychological Science", 
  "language": "eng", 
  "title": "Antigravity Hills are Visual Illusions", 
  "issued": {
    "date-parts": [
  "abstract": "<p>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.</p>", 
  "author": [
      "family": "Bressan, Paola"
      "family": "Garlaschelli, Luigi"
      "family": "Barracano, Monica"
  "page": "441-449", 
  "volume": "14", 
  "type": "article-journal", 
  "issue": "5", 
  "id": "1006741"
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