(LASVEGAS.CBSLOCAL) — Watching excessive amounts of online pornography can adversely affect a person’s short-term memory and decision-making ability.

In the first study of its kind, German scientists linked the brain’s ability to complete a task, reason, and understand concepts with people’s viewing of pornographic images. The 28 heterosexual men in the University of Duisburg-Essen study were tasked with viewing a combination of pornographic and non-pornographic pictures while also trying to keep their order straight.

The men – an average age of 26 – viewed the pictures and were asked to touch a “yes” or “no” key to indicate whether the mixed sexual and non-sexual images had been seen four slides before. The study found a significantly greater amount of wrong answers from the men who viewed more of the pornographic images.

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