Robert William Pickton's verbal and performance skills as reflected in the IQ test is below average but his reasoning appears to be above average, an expert witness on intelligence testified Monday.

Larry Krywaniuk told the B.C. Supreme Court in New Westminster the average score of an IQ test is 100 and Pickton scored 80 in verbal skills and 95 in performance skills.

Robert William Pickton is on trial for the deaths of six women who went missing from Vancouver's Downtown Eastside.
Robert William Pickton is on trial for the deaths of six women who went missing from Vancouver's Downtown Eastside.
(Jane Wolsak/Canadian Press)

Pickton, a Port Coquitlam pig farmer, is on trial for six counts of first-degree murder in the deaths of Sereena Abotsway, Mona Wilson, Andrea Joesbury, Brenda Wolfe, Marnie Frey and Georgina Papin.

He is to face a second trial later on an additional 20 counts of first-degree murder in connection with the deaths of women from Vancouver's Downtown Eastside. He has pleaded not guilty to all 26 charges.

Krywaniuk also testified about Pickton's scores in specific areas. For instance, Pickton scored six out of 20 on the vocabulary test — well below the average score of 10, he said.

The defence witness said someone with this score would have trouble with short-term memory and with understanding words and ideas.