Simons and Chabris (1999)
Updated: 2/14/2020
Simons and Chabris (1999)
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Storyboard Description

Gorillas in our midst: sustained inattentional blindness for dynamic events.

Storyboard Text

  • There were 228 participants, recruited via volunteer sampling. They were offered a rewards of a candy bar or a smal, payment.
  • Researchers created four video tapes showing teams of three players moving randomly around the space passing an orange ball.
  • Twenty one experimenters tested participants individually, using a standardised instruction script and written protocol.
  • Participants were shown the clip on television ranging from 13-36 inches. In one condition a woman with an open umbrella walked in and in the other condition P's saw a gorilla.
  • There were two styles of video; transparent and opaque and the third variable was the team colour P's were asked to follow; black or white. P's were asked to keep a silent mental count of total passes or count each bounce pass and aerial pass separately (hard condition.)
  • P's were then asked a series of question about an 'unusual event' and of the 192 participants (the useful data) 46% failed to notice the event.
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