View Full Version : "The right brain hemisphere is dominant in human infants"

08-23-13, 12:14 AM
The right brain hemisphere is dominant in human infants (


The development of functional brain asymmetry during childhood is confirmed by changes in cerebral blood flow measured at rest using dynamic single photon emission computed tomography.

Between 1 and 3 years of age, the blood flow shows a right hemispheric predominance, mainly due to the activity in the posterior associative area. Asymmetry shifts to the left after 3 years.

The subsequent time course of changes appear to follow the emergence of functions localized initially on the right, but later on the left hemisphere (i.e. visuospatial and later language abilities).

These findings support the hypothesis that, in man, the right hemisphere develops its functions earlier than the left.


08-23-13, 08:54 AM
onions??? funniest typo I've seen in quite a while. :giggle:

That's not a recent study, and from what I've read, both sides of the brain
connect with each other. I guess it's interesting that it develops in stages,
but didn't we already know that?

Understanding the Myth and Reality of Left Brain and Right Brain Dominance (

08-23-13, 12:17 PM
"'s interesting that it develops in stages.." (Lunacie)


Lower subcortical emotional system precedes higher cortical executive system. (Before 4)

Importance cannot be understated.

Between 1 and 3 years of age, the blood flow shows a right hemispheric predominance, mainly due to the activity in the posterior associative area. Asymmetry shifts to the left after 3 years.*(quote from OP summary (


08-23-13, 12:47 PM
Primary Sensory Cortex

For each of the major senses, there is an area called the primary sensory cortex. These are represented with dark blue in the diagrams and include somatosensory, visual, auditory, vestibular, taste, smell, visceral sensations. Something that isn’t shown is the vestibular cortex which is located in the insula, just below the temporal and frontal lobes.

Primary Olfactory Cortex

On top of the cribriform are the nasal foramina and they hit the olfactory bulb which then run toward the primary olfactory cortex through the olfactory tract. This cortex is where you get sensation of smell, before you’ve figure out what the smell is.

The olfactory cortex is located on the medial aspect of the temporal lobe, in the uncus (aka piriform lobe). The olfactory cortex is also called the Rhinencephalon, or “nose brain.” This is the most primitive part of the cerebrum and connects directly to the limbic system (emotional system), which is why smells often directly trigger emotions as well as our deepest memories.

08-23-13, 01:28 PM
The right hemisphere of the mother's brain, the side where our unconscious emotions reside, programs the infant's right hemisphere.

In the early months, the most important communications between mother and infant are unconscious ones.

Incapable of deciphering the meaning of words, the infant receives messages that are purely emotional.

They are conveyed by the mother's gaze, her tone of voice and her body language, all of which reflect her unconscious internal emotional environment.

Anything that threatens the mother's emotional security may disrupt the developing electrical wiring and chemical supplies of the infant brain's emotional-regulation and attention-allocating systems.*

Within minutes following birth, the mother's odors stimulate the branching of millions of nerve cells in the newborn's brain.

A six-day-old infant can already distinguish the scent of his mother from that of other women.

Later on, visual inputs associated with emotions gradually take over as the major influences..

-Gabor Mate, M.D., Scattered, P 70