allen and his colleagues are cautious about their results also because the researchers do not make visible whether it was the surgical that contributed to the children ' s cognitive deficits , or whether it was an underlying condition that may have needed surgery and occasioned the learning troubles . of the more than 5 , 000 subjects studies , 593 needed at least one surgery and just over 100 parents needed more than two before time 3 . there may be nothing unusual about this population of children that could have made them susceptible to reading difficulties and required they undergo operation and anesthesia .
Anesthesia causes learning disabilities.