3. Toxic Stress Derails Healthy Development
Center on the Developing Child at Harvard University
Sep 29, 2011
Learning how to cope with adversity is an important part of healthy development. While moderate, short-lived stress responses in the body can promote growth, toxic stress is the strong, unrelieved activation of the body’s stress management system in the absence of protective adult support. Without caring adults to buffer children, the unrelenting stress caused by extreme poverty, neglect, abuse, or severe maternal depression can weaken the architecture of the developing brain, with long-term consequences for learning, behavior, and both physical and mental health.
This video is part three of a three-part series titled “Three Core Concepts in Early Development” from the Center and the National Scientific Council on the Developing Child. The series depicts how advances in neuroscience, molecular biology, and genomics now give us a much better understanding of how early experiences are built into our bodies and brains, for better or for worse. Healthy development in the early years provides the building blocks for educational achievement, economic productivity, responsible citizenship, lifelong health, strong communities, and successful parenting of the next generation.
Also from the “Three Core Concepts in Early Development” Series
The human brain is organized into large-scale functional modules that have been shown to evolve in childhood and adolescence.
However, it remains unknown whether the underlying white matter architecture is similarly refined during development, potentially allowing for improvements in executive function.
In a sample of 882 participants (ages 8–22) who underwent diffusion imaging as part of the Philadelphia Neurodevelopmental Cohort, we demonstrate that structural network modules become more segregated with age, with weaker connections between modules and stronger connections within modules.
Evolving modular topology facilitates global network efficiency and is driven by age-related strengthening of hub edges present both within and between modules.
Critically, both modular segregation and network efficiency are associated with enhanced executive performance and mediate the improvement of executive functioning with age. Together, results delineate a process of structural network maturation that supports executive function in youth.
What Sleeping Babies Hear
A Functional MRI Study of Interparental Conflict and Infants’ Emotion Processing
Alice M. Graham, et al. http://pss.sagepub.com/content/24/5/782
Experiences of adversity in the early years of life alter the developing brain.
However, evidence documenting this relationship often focuses on severe stressors and relies on peripheral measures of neurobiological functioning during infancy.
In the present study, we employed functional MRI during natural sleep to examine associations between a more moderate environmental stressor (nonphysical interparental conflict) and 6- to 12-month-old infants’ neural processing of emotional tone of voice.
The primary question was whether interparental conflict experienced by infants is associated with neural responses to emotional tone of voice, particularly very angry speech.
Results indicated that maternal report of higher interparental conflict was associated with infants’ greater neural responses to very angry relative to neutral speech across several brain regions implicated in emotion and stress reactivity and regulation (including rostral anterior cingulate cortex, caudate, thalamus, and hypothalamus).
These findings suggest that even moderate environmental stress may be associated with brain functioning during infancy.
Keywords: psychological stress, neuroimaging, emotional development, infant development
“Putting together a puzzle of a face,” Sherman says, “he initially had put the eyes in the wrong place and then looked at my face and said, ‘Oh, no, your nose actually goes between your eyes.’ ”
Intelligence quotient (IQ) is a standardized measure of human intellectual capacity that takes into account a wide range of cognitive skills. IQ is generally considered to be stable across the lifespan, with scores at one time point used to predict educational achievement and employment prospects in later years.
Neuroimaging allows us to test whether unexpected longitudinal fluctuations in measured IQ are related to brain development.
Here we show that verbal and non-verbal IQ can rise or fall in the teenage years, with these changes in performance validated by their close correlation with changes in local brain structure.
A combination of structural and functional imaging showed that verbal IQ changed with grey matter in a region that was activated by speech, whereas non-verbal IQ changed with grey matter in a region that was activated by finger movements.
By using longitudinal assessments of the same individuals, we obviated the many sources of variation in brain structure that confound cross-sectional studies.
This allowed us to dissociate neural markers for the two types of IQ and to show that general verbal and non-verbal abilities are closely linked to the sensorimotor skills involved in learning.
More generally, our results emphasize the possibility that an individual’s intellectual capacity relative to their peers can decrease or increase in the teenage years.
This would be encouraging to those whose intellectual potential may improve, and would be a warning that early achievers may not maintain their potential.
journalistic versions: As Brain Changes, So Can IQ
October 20, 2011 http://online.wsj.com/news/articles/SB10001424052970203752604576641133332697322
The varying IQ scores could also indicate the test itself is flawed.
“It could be a real index of how intelligence varies or it could suggest our measures of intelligence are so variable,” said neuroimaging pioneer B.J. Casey at Cornell University’s Weill Medical College, who wasn’t involved in the study.
IQ is not fixed in the teenage brain
19 October 2011 http://news.sciencemag.org/2011/10/iq-not-fixed-teenage-brain
The test results revealed dramatic changes: between their first testing and their second, the teens’ verbal and nonverbal IQ scores rose or fell by as many as 20 points (on a scale for which the average is 100).
0. Keynote Address
Thomas R. Insel, MD, National Institute of Mental Health
I. Neural Development
I.1 Sensitive Periods in Brain Development
Takao Hensch, PhD, Harvard University
I.2 Structural and Molecular Changes in the Developing Brain
Ed Lein, PhD, Allen Institute for Brain Science
I.3 New Tools to Investigate Brain Development
Speaker Forthcoming
II. Cognitive Development
II.1 Language Development
Patricia Kuhl, PhD, University of Washington
II.2 Early Attachment, Emotional Development and Differential Susceptibility to Environmental Influences
Jay Belsky, PhD, University of California, Davis
II.3 Social Learning and Development
Andrew Meltzoff, PhD, University of Washington
III. Social and Environmental Influences on Brain Development
Moderator: Catherine Monk, PhD, Columbia University
III.1 Effects of a Stressful Environment on the Developing Brain and Behavior: Prenatal through Early Life
Tracy L. Bale, PhD, University of Pennsylvania
III.2 Role of Early Experience in Neuro-Affective Development
Nim Tottenham, PhD, UCLA
III.3 Impact of Poverty on the Developing Brain
Martha Farah, PhD, University of Pennsylvania
III.4 Can We Apply the Basic Principles of How Stress Affects Development to More Complex Childhood Psychopathologies?
Charles Nelson, PhD, Boston Children’s Hospital, Harvard University
IV. Spotlight on Nutrition and Brain Development
This session is co-presented with The Sackler Institute for Nutrition Science at the New York Academy of Sciences
Moderator: Mandana Arabi, MD, PhD, The Sackler Institute for Nutrition Science
IV.1 An Overview on Nutritional Status and Brain Development: The Importance of Timing in Determining the Right Intervention and Brain Assessment
Michael Georgieff, MD, University of Minnesota
IV.2 Standardizing Growth and Nutritional Status Biomarkers And The Tools To Assess Their Effects On Early Childhood Development
Edward Frongillo, PhD, University of South Carolina
IV.3 The Role of Micronutrients in Brain Development: The Most Useful Biomarkers that Relate to Optimal Childhood Development
Maureen M. Black, PhD, University of Maryland
IV.4 Iron Deficiency and the Developing Brain: a Paradigm for Interdisciplinary Approaches to Nutritional Neuroscience
Betsy Lozoff, MD, University of Michigan
V. Translating Research into Intervention, Education, and Policy
Moderator: Susan Magsamen, MS Johns Hopkins University
V.1 Leveraging Science to Improve Early Childhood Developmental Intervention
Joseph Piven, MD, University of North Carolina School of Medicine, Carolina Institute for Developmental Disabilities
V.2 Minding the Baby, an Intervention to Improve Early Childhood Development Outcomes in At-Risk Mothers and Infants
Linda C. Mayes, MD, Yale School of Medicine
Named for a landmark study that found that children born into poverty hear 30 million fewer words by age three than more affluent children, Thirty Million Words Initiative (TMW) develops evidence-based interventions designed to impact this ‘word gap’ by targeting parental/caregiver knowledge, beliefs and language behavior at a population level.
The goal is to map our research-based interventions onto existing infrastructure nationally.
Grounded in behavior change theory, TMW’s flagship multimedia curriculum, TMW-Home Visiting, gives caregivers strategies that can strengthen children’s cognitive development using the TMW 3Ts: Tune In and respond to what children communicate; Talk More and build child vocabulary through descriptive language; and Take Turns to engage children in conversation and foster curiosity and knowledge.
TMW does not require changes to cultural practices or idiomatic speech, but rather focuses on enhancing adult-child interactions to positively impact development.
TMW has a dual-generation approach and works through three tiers of intervention. Individual interventions focus on reaching parents and caregivers in economically disadvantaged communities. Community-based interventions targeted neighborhoods and populations through community-based, civic, cultural, religious, health and education organizations, and professional networks that provide care to children from 0-3 years of age. Population-level intervention shapes public awareness via education, public health, and information infrastructures as engines for outreach.
This presentation describes our iterative developmental approach to evidence-based interventions and presents early findings demonstrating the promise of a parent/caregiver approach to impacting the ‘word gap.’ http://thirtymillionwords.org http://thirtymillionwords.org/wp/wp-content/uploads/2013/09/SSL-00517.pdf
V.4 Building Early Childhood Learning Systems: Early Head Start to the Classroom
Sharon Lynn Kagan, EdD, Teachers College, Columbia University
VI. How to Shape Policy to Address Different Critical Periods and Multiple Adversities
Moderator: Pia Britto, PhD, UNICEF
How does income affect childhood brain development? | Kimberly Noble
Apr 18, 2019
Neuroscientist and pediatrician Kimberly Noble is leading the Baby’s First Years study: the first-ever randomized study of how family income changes children’s cognitive, emotional and brain development.
Modular Segregation of Structural Brain Networks Supports the Development of Executive Function in Youth
Tablets and smartphones damage toddlers’ speech development
What Sleeping Babies Hear
Clues To Autism, Schizophrenia Emerge From Cerebellum Research
Shaping the Developing Brain: Prenatal through Early Childhood