There were 4 video tapes, each 75 secs long
The video was of 2 teams of 3 people (one wearing white the other black) they were passing a basketball in a standardised order
After 44-48 seconds an unexpected event occured
A woman walked left to right with either an open umbrella or wearing a gorilla costume
The video was either transparent or opaque with the easy task (count number of passes) or hard task (count number of bounce/chest passes)
After the experiment ppnts were asked to write down the number of passes and were asked questions such as "Did you notice anything unusual in the video" or "Did you notice anything other than the 6 players"
Ppnts were then fully debriefed