The most common cause of the loss of this function in the U.S. is side effects from the powerful antibiotic gentamicin.

FORBES: Magazine Article

"The worst impact is the loss of biological function that these wild animals fulfil in nature, " he told the BBC.

BBC: Brazil moves to curb wildlife trafficking

But the groups who played the computer game showed a clear improvement compared with the normal loss of cognitive function as people age.

WSJ: When Computer Games May Keep the Brain Nimble