Accused gunman Noet Barnett has a “very low” IQ and the mental age of a nine or ten year old, a jury heard.Psychologist Guy Fowle was called by the defence in the case. He told the jury Mr Barnett’s brainpower is in the “lowest one percentile” of the population.Mr Barnett is said by prosecutors to be the gunman who opened fire on Jeremiah Dill on October 4 2010.He is alleged to be a member of the 42 gang who opened fire on Parkside member Mr Dill in vengeance, because Parkside murdered three of his cousins.His DNA was found on the weapon used in the crime and an eye witness told police she recognised him as the shooter.Mr Barnett, 25, told police after his arrest more than three months later that he was travelling to a job interview at the time of the shooting.However, prosecutors have called evidence showing his interview was actually six days earlier, on September 28.In his evidence yesterday, Dr Fowle, who did a full intellectual evaluation of Mr Barnett, said he has an IQ of 63. This puts him in the lowest one percent of the population and is “very low”.Dr Fowle explained: “Although you cannot make a direct comparison, adults with an IQ of 63 are considered to be able to think at the level that a nine or ten year old would, mentally.”He told the jury Mr Barnett fell into the category of “mild mental retardation”.He further explained: “The level of thinking being in the mentally retarded range does indicate that that person would have a hard time understanding material that is complex, long, or involves looking at different points in time.“If you want to look at Mr Barnett’s ability to do that, one might look at what a nine or ten year old would do in terms of understanding what’s being asked and expressing themselves in words.”During the prosecution case, defence lawyer Ms Pearman suggested to witnesses that Mr Barnett talks with a stutter and appears to be “slow” and “mentally challenged” in videotapes of his police interviews.She pointed out how, during the interviews, Mr Barnett admitted that he can’t read, did not finish school, and appeared to have trouble understanding his legal rights and recalling dates and times.Asked if it would be easy to spot that Mr Barnett is mentally retarded, Dr Fowle replied: “I don’t think it necessarily would be easy to spot because people at that level of functioning very easily learn social cues and what you’re supposed to say to get along.”He added: “Mr Barnett says ‘yeah’ to everything, or nine out of ten things, and some of those things he would not know”.Asked if it would be easy to fool the test process by playing dumb, the psychologist said he felt Mr Barnett was genuinely trying to answer his questions, and also has a history of similar test results going back to the age of 13.Ms Pearman also inquired about Mr Barnett’s habit of giving times in a back-to-front fashion, such as saying his job interview was at “10.30, 10” and his goddaughter is “five or three”.Dr Fowle replied: “To me, that would be a sense of being confused about the idea of time.”He explained this habit is rarely seen except in young children.Mr Barnett denies attempted murder, using a firearm to commit attempted murder and handling a firearm, and the case continues.