Research is showing the old mechanical model of brain communication may be not fully accurate.

Here are some interesting links.

http://www.sciencedaily.com/releases/2016/01/160114121806.htm

http://www.sciencealert.com/scientists-discover-new-method-of-brain-wave-transmission-electrical-fields

http://www.sciencealert.com/here-s-how-the-brain-creates-pockets-of-sleep-to-help-us-doze-off-and-remember?utm_source=Article&utm_medium=Website&utm_campaign=InArticleReadMore

Neurons in brain tune into different frequencies for different spatial memory taskshttp://www.sciencedaily.com/releases/2014/04/140417124356.htm

Can Neural Activity Propagate by Endogenous Electrical Field?

http://www.jneurosci.org/content/35/48/15800