We don't know. Most records of these experiments have been hidden or destroyed. In 1951 LC was 17, a minor. So this falls into the cayegory of "experiments on children." A violation of the Geneva Convention.
It looks like him. I've shown it to people and asked them to ID the man, and they give the same answer. Given the blindfold, he probably was unaware he was being photographed. Photos like this have been used for blackmail.
IN 2009 a Montreal filmmaker found this on the web. It.was captioned "1951 HEBB EXPERIMENT, MCGILL". Despite heading the Debating Society and winning a poetry award, Leonard didnt do very well at McGill - typical of students who volunteered for Hebb's experiments and suffer from lifelong anxiety and depression. Leonard Cohen famously suffers from both.
In the 1990s or early 2000s he told his agent KELLEY LYNCH and her mother over Greek food and a bottle of ouzo that he was in the MKULTRA program. Kelley's mother has written an affidavit to that effect. Note that Kelley's father was US Air Force - linked to MKULTRA.
THE MKULTRA PROGRAM RAN AT MCGILL FROM 1953 - 1964. THE HEBB SENSORY ISOLATION EXPERIMENTS WERE A MAJOR PART OF THAT PROGRAM. Research enabled by the CIA often involved experiments on children and brought McGill international recognition in psychiatry and neuroscience
Before it was changed to MKULTRA in 1953 it went by the codename ARTICHOKE.