Since all thalamo-cortical activity is considered alpha, much theta activity is truly slowed alpha activity (which is recognizable by its sinusoidal shape). The thalamus can gate as slow as 2Hz and as fast as 14 hz. However, theta is limbically generated in the septo-hippocampal circuit, as well as generated by the nucleus accumbens in the forebrain. Limbically generated theta is thought of as frontal midline theta, since the limbic projections are spatially limied, corticall, at the frontoal and central midline. However, if it is longer than one second it is not frontal midline theta, but more the theta that is attention deficit disorder theta. <br><br>The nucleus accumbens is a part of the reward network (it is considered a monopole because all of the dipoles in it add to zero—it is tightly hooked to the rostral anterior cingulate). The nucleus accumbens provides acetochyline to the temporal lobes via the diagonal band of broca, which creates a feedback loop involving the amygdala and the hippocampus complex. The parahippocampal cortex reflects the temporal lobe's monopoles of the hippocampus and amygdala. This feedback loop creates the theta rhythm ,which is occurring in the septo-hippocampal circuit.  Acetylcholine&nbsp;causes muscles to contract, activates pain responses and regulates endocrine and REM sleep functions. <br><br><b>Interesting fact:</b> <i>The venom of a black widow spider acts by causing the release of acetylcholine. When a person is bitten by a black widow, their acetylcholine levels rise dramatically, leading to severe muscle contractions, spasms, paralysis, and even death.</i><br><br><p style="text-align: center;"><img src="@@PLUGINFILE@@/dopamine-deficient.png" alt="In ADD/ADHD is dopamine deficient" width="419" height="399" class="img-responsive atto_image_button_text-bottom" style="font-size: 1rem;"></p><p style="text-align: center;"><span style="font-size: 1rem;">In ADD/ADHD is dopamine deficient</span></p>