Slocombe and Zuberbuhler's study is the first experiment to show that vocal sound can carry meaning for chimpanzees.

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But Sandborn considers Smarr a scientist conducting an experiment on himself, and the pilot study is ongoing.

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Seventy French university students were recruited for the study and told they would be participating in a three-day experiment testing the effects of brightness of video games on visual perception.

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Another example, in a study published last year: Students in an experiment where they were given the same information about a fictitious company and asked to estimate its value.

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