Hi Batgirl, Nam,

From About.com:

"Right Brain: The right brain controls the artistic abilities of a person. A person with a predominant right brain over the left brain will be more artistic, creative and spontaneous."

"In our schools today, more emphasis is given to Left Brain Activities like math, logic, spelling, and related activities as compared to right brain activities. We can however, influence development of both sides of the brain equally by introducing the child to more right brain activities alongside with the more traditional logic, math and spelling activities. Right Brain Activities involve a lot of visuals, patterns, fluidity, role playing and imagination."

Source: Right Brain vs Left Brain by Dipika Mirpuri

Is 'unable to draw' a voluntary choice based on feelings or a conscious decision not to draw? Is artistic ability affected, that is the quality or imagination required to produce the art not the same as before?

"Children tend to draw the part of the trauma they don't understand, the part they're 'stuck' on. Like adults, sometimes what they're saying is not what they're feeling. When they draw, they put it all out on paper," says Suzanne Silverstein, president and co-founder of the Psychological Trauma Center at Cedars-Sinai.