A study showed people who have been drinking may miss objects that appear unexpectedly in their field of sight, even when their blood alcohol levels are just half the legal driving limit.

The study said this phenomenon, known as inattentional blindness, occurs commonly among people who are sober.

To investigate, the researchers had 47 volunteers watch a video of two teams passing basketballs back and forth and asked them to count how many times the team wearing white T-shirts passed the ball.

During the video, a woman dressed in a gorilla suit appeared among the players, stood in the middle of the screen and beat her chest, and then walked away.

The subjects were given a beverage and asked to drink it over a 10-minute period five minutes before watching the video. After viewing it, the researchers interviewed them to determine if they'd seen the gorilla.

Half of the study participants were given a placebo drink, while the other half consumed a vodka and tonic formulated to bring their blood alcohol level up to half the legal driving limit for most states, or 0.04.

Half of people within each of those groups were then told they were given alcohol, while the other half were told their beverages didn't contain alcohol.

People who were told they had received alcohol reported feeling more intoxicated, but that had no effect on their likelihood of seeing the gorilla-costumed woman. Overall, one third of the study participants didn't notice the gorilla.

Among those who were sober, 46 percent spotted the gorilla, compared to 18 percent of the intoxicated group.

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