That is the claim of psychologists who have found that tapping away on a mobile phone or computer keypad or checking them for electronic messages temporarily knocks up to 10 points off the user's IQ.
心理学家发现人们在使用手机或电脑键盘打字或者用它们查询电子信息时，智力会暂时降低10个百分点。
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In other words, these busy iPhone users didn't have time to goof off by clicking (or rather, tapping) through on a mobile ad.