Theta EEG activity is
observed during learning, especially
for movement directed tasks. This
EEG activity is generated
synaptic oscillations and discharge activity
among many thousands (possibly millions)
of midbrain, hippocampal and neocortical
neurons subserving navigation, motor planning
and limbic system integration.
The sensory/motor integration circuitry
that drives theta EEG activity can be separated
into two ascending pathways: Type 1 and
2, distinguished by behaviour and drug sensitivity, based on different synaptic,
circuit and network properties associated
with these two brain oscillation rhythms.
See BH Bland for details.