Does Gardinal Cause Memory Problems And Absent Mindedness?

Hi Doctor...My son right now 28 years old...He is very dull in terms of memory..He doesnt beave normal..in sense sometimes if he gets angry he hits me...He has done WWW.WWWW.WW and then we joined him to do MBA...From beginning he was not at all interested..so during the 2 yrs he stuggled to study..and we saw lot of changes in him...and finally he discontued the course...he is very slow in grasping things..very absent minded..We took to few doctors(psychiatrist)..They told this is due to residual effect of Gardinal which he took when he was 6 mnths old for 3 years..i just want u'r opinion on this..