Well theres quite alot to it, maybe too much for your seemingly rather narrow mind to take. But in a paragraph, its oscillatory properties of thalamic neurons and corticothalamic excitatory postsynaptic potentials. It's temporal coherence. Such coherence would be embodied by the simultaneity of neuronal firing based on passive and active dendritic conduction along the apical dendritic core conductors.
There is this thing called education that you may have heard of....you should go get one.
Heres a study you can reference, carried out by the Department of Physiology and Neuroscience, NewYork University School of Medicine:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1692417/pdf/9854256.pdf
Edit: To be honest, don't be lazy and do your own fucking research, google is a good website. Rather than asking me such a question, why not type it in to a search engine and find out for yourself? Its a massively vast topic, and theres far too much for me to write here.