<p>By the time a baby is born, the creation of neurons is virtually complete. Neurons continue to grow dendritic branches well after birth. At birth, a baby’s brain is less than 1 pound of gelatinous tissue. This is the foundation of the unconscious processes. During this time, as well, delta is prominent because the white matter is not yet myelinated. Consequentially, infants spend a great deal of time in slow-wave sleep, and thus have delta wave activity as their predominant wave form. Analysis of the waking EEG of a newborn infant indicates that delta wave activity is predominant in that age, and still appears in a waking EEG of five-year-olds.[14]</p><p>The neonatal weeks are crucial for the neurophysiological effects of nursing on the somato-sensory projection areas of the mouth and the relevant associative cortical areas. Chugani et al. (1987) have shown in PET recordings that during the first weeks of life there is an increase in blood flow in those brain structures (brain stem, cerebellum, striatum and the sensory areas of the cortex) that participate in nursing responses. At six months, the theta rhythm prevailed in both hemispheres, but had a right hemisphere posterior maximum. Paul et al. (1996) have shown in infants from the age of 2 to 26 weeks that feeding is connected with an amplitude increase and a growing degree of synchronization in the EEG, with an exception of the age of 10 weeks, when no significant EEG changes were recorded. This newly acquired neurophysiological organization between subcortical and cortical structures can give rise to a synchronized activity in wide brain areas (Scher, 1989). The special kind of θ-activity whose activation we were able to recognize during feeding in 6 month-old infants has been termed hedonic θ-activity by Maulsby (1971).</p>