A 56-year-old Montreal homeless man accused of sexually molesting a teen boy on a city bus eight months ago will undergo further psychiatric testing to see if he was criminally responsible for his alleged actions.

Amir Pourasadi has already undergone an evaluation over the past 30 days to see if he is fit to stand trial.

Crown prosecutor Amélie Rivard said it wasn't conclusive and suggested contradictory results that indicated the accused may not understand the charge he faces. 

But defence attorney Louis Morena said after a couple of questions in court, it appears his client is apt to continue proceedings at this point.

"He seems to know exactly where he is, who's in front of him, who's who. In that circumstance, the judge said let's proceed and see whether or not he has a defence which is of primary importance, to see whether or not that defence is available to him, on the responsibility or not," Morena told reporters.

The judge agreed to a 16-day extension so Pourasadi can be assessed to see if he was suffering from a mental disorder at the time of the alleged crime.

Pourasadi is charged with sexually touching a 13-year-old boy in December on the 24 bus in NDG. He also faces a charge in another similar incident two months later involving a young girl on the 55 bus.

Pourasadi will remain detained at the Pinel Psychiatric Institute until his court date next month.