This is a good question and one I'm asking too. We're in the process of seeing a 2e specialist so I don't have a definitive answer for you at the moment - except she briefly mentioned about the sensory issues too and the fact that my son has spent nearly all his life in therapy.

My 6.5 yr-old son was born with some physical issues. He was diagnosed early (under a yr) with severe sensory integration disorder/dysfunction (across all domains, if I remember correctly). He had a lot of delays and had over 5 years of pt/ot, including at a sensory gym. So I can definitely relate here. He also finished 2.5 years of vision therapy over the holidays. Visual processing deficits can often overlap with sensory/anxiety issues.

Until we placed our son in a private gifted school, we thought the sensory stuff and asynchronous development related to the special needs. We had no idea that they may be related to giftedness. We knew our son was bright, but had no clue how bright until he went through the curriculum so quickly at the private gifted school and the teacher told us that he might be eg/pg.

OT in a sensory gym can reduce the sensory overload or input. I can attest that it does work, over time, a lot of effort, and patience. The sensory diet can help; "The Out of Sync Child" is a classic in the field. Vision therapy, too, can make a world of difference too.

I've noticed that my son's OE's particularly flare up when he's going through a big development. He seems to be overstimulated and overwhelmed easily at times. I withdrew him from school a couple of weeks before it ended and plan on homeschooling him next year. I'm hoping this will reduce some of the OEs as well or at least we find a way to live with them more easily than we have been.

Here's a checklist on sensory processing disorder:
http://www.sensory-processing-disorder.com/sensory-processing-disorder-checklist.html

And other links on it:
http://www.sinetwork.org/about-sensory-processing-disorder.html

http://www.sengifted.org/archives/a...on-in-the-gifted-and-talented-population