<p style="text-align: center;"><br><img src="@@PLUGINFILE@@/unhealthly-theta.png" alt="Unhealthy Theta" width="1008" height="540" class="img-responsive atto_image_button_middle"><br></p><p style="text-align: center;"><br></p><p>Unhealthy theta can mean many different things in EEG. From a clinical perspective, theta can indicate concussion or head trauma, as well as attention deficit disorder, distractibility, foggy thinking, inability to sequence tasks, forgetfulness, or daydreamy-ness. One with excess theta might be accused of being a “space-cadet.”&nbsp; Having too much theta with eyes open would cause one to feel unable to focus on the task at hand for a long period of time. Any "theta band" activity may be slowed thalamo-cortical alpha or limbically generated rhythmic slow activity (theta), as stated in Steriade's 1990 IFCN position paper.</p><p><br></p><p style="text-align: center;"><img src="@@PLUGINFILE@@/soccer-athlete-theta.png" alt="Post Concussive Syndrome in a 17-year old Soccer Athlete, excessive occipital theta (Z-score summary map)" width="720" height="955" class="img-responsive atto_image_button_text-bottom"><br></p><p style="text-align: center;">Figure : Post Concussive Syndrome in a 17-year old Soccer Athlete, excessive occipital theta (Z-score summary map)<br></p><p style="text-align: center;"><br></p><p style="text-align: center;"><img src="@@PLUGINFILE@@/excessive-theta.png" alt="Figure : Excessive Theta at the right posterior temporal lobe (Eyes Closed)  (Raw Data)" width="717" height="1108" class="img-responsive atto_image_button_text-bottom"><br>Figure : Excessive Theta at the right posterior temporal lobe (Eyes Closed) (Raw Data)<br></p><p style="text-align: center;"><br></p><p style="text-align: left;">When there is a lack of blood flow and oxygen to the area, there is often a consequential slowing of alpha at the area, sometimes into the theta range. As an area degrades, sometimes the alpha slows considerably below the normal alpha band (i.e. less than 8hz). A slowed alpha can represent a compromise of blood flow, and consequentially oxygen, to an area, which will lead to ischemia. The dip in alpha frequency will indicate how severe the ischemia is (Classen and Foreman, 2012). Theta will arise with grey matter damage, which can be resultant of a trauma (such as a blow to the head), a vascular anomaly, an aneurism or structural anomaly (like the jarring of the cerebro-cervical juncture in a car accident).<br><br></p><p style="text-align: center;"><img src="@@PLUGINFILE@@/theta-and-vascular.png" alt="Theta and Vascular Dementia" width="835" height="661" class="img-responsive atto_image_button_text-bottom"><br></p><h3 style="text-align: left;">DEMENTIAS</h3><p style="text-align: left;">Parahippocampal slowing and slow alpha will
indicate an <b>Alzheimer’s</b> type dementia. If there is a frontal slowing of alpha
fronto-temporally, with a steady pace of alpha parietally and occipitally, that
indicates <b>Vascular Dementia</b>, indicating microbleeds working away at the frontal lobes memory content.
If there is a generalized slow EEG, there are tropic changes, which can
indicate <b>Korsakov’s syndrome</b> (which we see in sever alcoholics).
Thalamo-cortical dysrhythmias and subcortical abnormal activity indicate
<b>Parkinson’s disease </b>(which is seen in the substantia nigra) and<b> Lewy body
disease</b> is seen in cortical and subcortical abnormalities. However, Parkinson’s
dementia can have a Lewy body mix in it.<br></p><p style="text-align: left;">&nbsp;Lewy Body dementia can effect the anterior temporal pole
and insulae, which deteriorate disproportionately,&nbsp; leading to
hallucinations, loss of sense of smell (which is the mesial temporal surface,
the uncus, degrading). Lewy body is difficult because the individual will drift
in and out from hallucinatory states to normal states, making the
hallucinations seem all that more real. This is the same disorder that Robin
Williams had when he died.<br></p>