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I've heard that part of cognitive processing is information passing between left and right cerebral hemispheres.

This is what happens in the Cerebral Cortex which is divided into two hemispheres, left brain and right brain connected by a thick layer of nerve fibers called the corpus callosum. These nerve fibers allow messages to pass between the left and right brain hemispheres

My question is When a thought 'crosses your mind', does it literally cross between left and right cerebral hemispheres?

Assumptions:

  • I'm making a big leap from 'electronic impulses of neurons' to 'thoughts'.
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  • $\begingroup$ You haven't really defined "a thought crossing your mind" at all. People without functioning corpus callosa have fleeting thoughts too, so at first glance, the answer is probably no. $\endgroup$
    – Nick Stauner
    Jul 16, 2014 at 6:41

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Neuroscience doesn't really have a clear model for what a "thought" consists of exactly. Certain processes that are involved in thought have begun to be mapped--for example, this recent paper talks about a model for how the brain associates location in space with it's own mental map (http://www.ncbi.nlm.nih.gov/pubmed/24462102, I'll try to find something related that's not behind a paywall...). This one doesn't address your particular problem though, they only measured activity on one side of the brain. So basically, it might be possible to partially answer your question for more specific brain processes, but different kinds of "thoughts" are processed in different ways.

And of course I am also conflating impulses crossing the corpus callosum with the thoughts themselves, but I don't think this is really accurate. The most popular models in the labs I'm familiar with suggest that a "thought" is composed of a bunch of neural activity taken together rather than the activities of a few neurons on their own. But that might ultimately just be arguing semantics.

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