Chapter 3- Physical & Cognitive Dev. In Infants and Toddlers Flashcards
The outer, folded mantle of the brain, responsible for thinking, reasoning, perceiving, and all conscious responses. Bigger than a monkey’s and rat’s cortex.
Cerebral cortex
A long nerve fiber that conducts impulses away from the cell body of a neuron.
Axons
A treelike branch fiber that receives information and conducts impulses toward the cell body of a neuron.
Dendrites
A gap between the dendrites of one neuron and the axon of another, over which impulses flow.
Synapses
Forming connections between neurons at the synapses. Responsible for all perceptions, actions, and thoughts. Most intense during infancy and childhood, and continues throughout life. A lifelong process, we continue to grow, learn and develop intellectually from age 1 to age 100+.
Synaptogenesis
A fatty layer covering the axons of neurons. This process, speeds the transmissions of neural impulses, continues from birth to early adulthood. A slow process.
Myelination
The lubricant that permits the neural impulses to speedily flow. May determine which cells thrive.
Myelin sheath
The part of the brain that interprets visual stimuli, axons are myelinated by about age 1. Intense while reading braille and localizing sounds in space.
Visual cortex
Brain region that involves higher reasoning and thought, the myelin sheath is still forming into our 20’s.
Frontal lobes
T or F: we need to get rid of unnecessary neurons to permit the essential cells to flower (to grow).
Neural pruning
Begins around age 1 in the visual cortex. Starts during late childhood in late childhood.
Neural pruning
Our cortex is malleable/changeable, able to be changed during infancy and childhood years. (Refers to neural and cognitive development).
Plastic
In the left hemisphere of the brain.
Language
T or F: if an infant has a stroke in the left hemisphere of the brain, the right hemisphere takes over, and language develops there in that right hemisphere.
T
permanent loss In understanding speech or forming words.
Stroke in left hemisphere of the brain, normal location of language
T or F: before the pruning phase, the brain is malleable/changeable.
T
How many neurons in the brain?
More than 100 billion neurons.
How many neural connections in synaptogenesis?
Makes 60 trillion neural connections
T or F: boy’s brains are 10% larger than girl’s brains, even during childhood.
T
1) Development unfolds “in its own neurological time” (you can’t teach a baby a skill when the brain is offline).
2) stimulation sculpts neurons.
3) the brain is still “under construction”.
Basic brain principles
Automatic sucking movements newborns make, when something touches their lips.
Sucking reflex
Newborn’s response to a touch on the cheek, if anything touches their cheek, they turn their head in that direction and suck. Without this physical cue, babies would have trouble finding the breast.
Rooting reflex
A response or action that is automatic. Does not depend on the cortex, not under conscious control.
Reflexes
Newborns automatically grasp anything that touches the palm of their hand.
Grasping