A great question from a great brother, who is planning a great gift! The answer is absolutely yes!!
Guided imagery mainly accesses the more primitive, survival-based areas of the brain, with soothing voice tone and music. As a result, it is not dependent on fancy cognitive abilities to do its job. In fact, this is why it can be used with small children; puppies and other pets; patients with Alzheimers and other forms of dementia; and people with various levels of developmental disability. It’s also why it reduces the symptoms of people with PTSD – most of those symptoms are lodged in the midbrain and brain stem, where “upscale” talking and thinking can’t reach.
So, by all means, get the iPod for your brother. He’s a lucky guy to have you in his corner!