Early Childhood
Infant & Toddler Mental Health:
Issues & Information for Educators
Instructor Name: Dr. Pamela Bernards
Facilitator Name: Aumony Dahl, M.Ed.
Phone: 509-891-7219
Office
Hours: 8
a.m. to 5 p.m. PST Monday-Friday
Email: aumony_dahl@virtualeduc.com
Address: Virtual
Education Software
16201
E Indiana Ave, Suite 1450
Spokane,
WA 99216
Technical
Support: support@virtualeduc.com
Welcome
to Infant & Toddler Mental Health:
Issues & Information for Educators, an interactive computer-based
instruction course designed to help you achieve a better understanding of
infant and toddler mental health, child development, and strategies you can use
to promote positive relationships with children and their families. This course
provides information that will help you to understand and identify your role as
a child care provider, educator, and early childhood
professional. Infant & Toddler Mental
Health will provide you with research-based information on early child development, attachment, temperament, and
curriculum. This course also lists resources for both teachers and parents who
would like more help or information about infant and toddler mental health.
This computer-based instruction course is
a self-supporting program that provides instruction, structured practice, and
evaluation all on your home or school computer.
Technical support information can be found in the Help section of your
course.
Course
Materials (Online)
Title: Infant
& Toddler Mental Health: Issues & Information for Educators
Instructor Name: Dr. Pamela Bernards
Facilitator Name: Aumony Dahl, M.Ed.
Publisher: Virtual
Education Software, inc. 2007, Revised 2010, Revised 2014, Revised 2018
Academic
Work
Academic work submitted by the individual
(such as papers, assignments, reports, tests) shall be the student’s own work
or appropriately attributed, in part or in whole, to its correct source.
Submission of commercially prepared (or group prepared) materials as if they
are one’s own work is unacceptable.
Aiding
Honesty in Others
The
individual will encourage honesty in others by refraining from providing
materials or information to another person with knowledge that these materials
or information will be used improperly.
Violations
of these academic standards will result in the assignment of a failing grade
and subsequent loss of credit for the course.
This
course is designed to be an informational course with application to early
childhood education or childcare settings. The curriculum and strategies
presented are designed for children from birth to thirty-six months of age.
Some alterations may be needed when working with children with sensory
processing disorders or other developmental disabilities. This course also incorporates the
applicable Division for Early Childhood (DEC) Recommended Practices in Early Intervention/Early Childhood Special
Education, in addition to the newest National Association for the Education
of Young Children (NAEYC) Accreditation Standards (2018), and the Every Student Succeeds Act (ESSA), which
was signed into law on December 10, 2015. ESSA both sustains and expands the
nation's investment in increasing access to high-quality early childhood
education for all children. This course is designed for anyone planning
programs for young children: childcare providers, early childhood educators,
and healthcare or social services providers, to name a few.
·
To define infant and toddler mental
health and explain why it is so important;
·
To discuss core concepts in early
development from birth to thirty-six months;
·
To explore current research on
brain development, including examining conditions for healthy development and
the effect of adverse experiences;
·
To increase the ability to observe
typically developing infants and toddlers, as well as to identify infants and
toddlers with mental health issues;
·
To provide information and best
practice methods used in the care of infants and toddlers and their families;
·
To increase knowledge in the
research areas of attachment and temperament; and
·
To provide resources for early
childhood educators and care-providers to help them strengthen the children and
families with whom they work.
The Infant & Toddler Mental Health course has been divided into
four chapters that are designed to inform parents, professionals, and care
providers by: providing an overview of the core concepts of early development;
reviewing developmental milestones; exploring current research on brain
development; examining what curriculum looks like for infants and toddlers;
exploring the importance of early attachment; reviewing different temperament
traits; and providing suggestions for strengthening families. Upon completing this course
you should have the basic framework
for understanding the critical role of infant and toddler mental health, as
well as developmental knowledge of children from birth to thirty-six
months.
Student Expectations
As
a student you will be expected to:
·
Complete all four
information sections showing a competent understanding of the material
presented in each section.
·
Complete all four section
examinations, showing a competent understanding of the material presented. You must obtain an overall score of 70% or higher, with no individual exam score below 50%, and successfully
complete ALL writing assignments to pass this course. *Please note: Minimum exam score requirements may vary by
college or university; therefore, you should refer to your course addendum to
determine what your minimum exam score requirements are.
·
Complete a review of any section on which your examination score was
below 50%.
·
Retake any examination, after completing an
information review, to increase that examination score to a minimum of 50%,
making sure to also be achieving an overall exam score of a minimum 70% (maximum
of three attempts). *Please note: Minimum exam score
requirements may vary by college or university; therefore, you should refer to
your course addendum to determine what your minimum exam score requirements
are.
·
Complete all course journal article and essay writing assignments with
the minimum word count shown for each writing assignment.
·
Complete a course evaluation form at the end of the course.
Chapter One is an Introduction to Infant & Toddler Mental Health. In this chapter we will clarify what infant
and toddler mental health is, discuss why it is so important, and review three
core concepts of early development. We
will look at current research on brain development and discuss optimal
conditions for the development of brain architecture in young children. We will also look at the life-long implications
that adverse early childhood experiences have on the developing brain. Lastly, we will discuss how the interaction
of biology, relationships, and environment impacts brain development in very
young children, and review the core values that support the philosophy of this
course.
Chapter 2: Additional Areas of Development
In Chapter Two we will look at
child development from infancy to thirty-six months. We will briefly review what experts have to
say about the following topics related to child development: child development
theory, development of emotions, development of self, human development, SIDS,
brain development, nutrition, development of vision and hearing, and finally,
language development.
Chapter 3: Personal
& Classroom Issues
In Chapter Three we will discuss
the importance of infant and toddler curriculum. You will learn some vital
information concerning curriculum, such as what is appropriate, what is
meaningful, and what promotes the relationship between you, the child, and the
child's family. We will review the latest information about play and how it
benefits a child's development. Finally, we will discuss school-readiness and
look at several key characteristics of school-ready children.
Chapter 4: Personal
& Family Issues
In Chapter Four we will discuss the
important role attachment plays in the development of young children. We will discuss different types of attachment
and examine several risk factors that impede healthy attachment in young children. We will look at methods for fostering secure
attachment. We will define temperament, examine specific temperament traits,
and review research about the impact of temperament on child development. We will discuss numerous practical strategies
for supporting all children, regardless of their temperament. Finally, we will
briefly discuss variables such as language and literacy, culture, gender, race,
and socio-economic status that may influence connections with families (these
variables will be thoroughly examined in another course in this series called Family-Centered Services). We will explore ways in which we can work to
strengthen families, which ultimately has a positive impact on the well-being
of the children we serve.
At the end of each chapter, you will be
expected to complete an examination designed to assess your knowledge. You may
take these exams a total of three times. Your last score will save, not the
highest score. After your third attempt,
each examination will lock and not allow further access. Your final grade for the course will be
determined by calculating an average score of all exams. This score will be printed on your final
certificate. As this is a self-paced
computerized instruction program, you may review course information as often as
necessary. You will not be able to exit any examinations until you have
answered all questions. If you try to exit the exam before you complete all
questions, your information will be lost. You are expected to complete the
entire exam in one sitting.
Pamela
Bernards has 30 years of combined experience in diverse PK-8 and high school
settings as a teacher and an administrator. In addition to these
responsibilities, she was the founding director of a K-8 after school care
program and founder of a pre-school program for infants to 4-year-olds to
address all early childhood issues. When she was a principal, her school
was named a U.S. Department of Education Blue Ribbon School of
Excellence. More recently, the school in which she serves as curriculum
coordinator was named a 2010 Blue Ribbon School. Areas of interest
include curriculum, research-based teaching practices, staff development,
assessment, data-driven instruction, and instructional intervention with
exceptional populations. She received a doctorate in Leadership and
Professional Practice from Trevecca Nazarene University. Please contact Professor Dahl if you have course content or
examination questions.
You may contact the facilitator by
emailing Professor Dahl at aumony_dahl@virtualeduc.com
or calling her at 509-891-7219, Monday through Friday, 8:00 a.m. - 5:00 p.m.
PST. Phone messages will be answered within 24 hours. Phone conferences will be limited to ten minutes per student, per
day, given that this is a self-paced instructional program. Please do not
contact the instructor about technical problems, course glitches or other
issues that involve the operation of the course.
If you have questions or problems related
to the operation of this course, please try everything twice. If the problem
persists please check our support pages for FAQs and known issues at www.virtualeduc.com and also the Help section of your
course.
If you need personal assistance
then email support@virtualeduc.com
or call
(509) 891-7219. When contacting
technical support, please know your course version number (it is located at the
bottom left side of the Welcome Screen) and your operating
system, and be seated in front of the computer at the time of your
call.
Minimum Computer
Requirements
Please
refer to VESi’s website: www.virtualeduc.com or contact VESi
if you have further questions about the compatibility of your operating system.
Refer to the addendum regarding Grading Criteria, Course Completion
Information, Items to be Submitted and how to submit your completed
information. The addendum will also note any additional course assignments that
you may be required to complete that are not listed in this syllabus.
Administration for Children and Families.
(2015). Children’s social-emotional and
behavioral health. Retrieved from www.acf.hhs.gov/programs/occ/resource/im-2015-01
Ainsworth, M., & Bowlby, J. (1965). Child care and the growth of love. London, UK:
Penguin Books.
Ainsworth, M. D. S., & Bell, S. M. (1970). Attachment, exploration, and separation:
Illustrated by the behavior of one-year-olds in a strange situation. Child
Development, 41, 49–67. doi:10.2307/1127388
Ainsworth, M. D. S., Blehar, M. C.,
Waters, E., & Wall, S. (1978). Patterns of attachment: A psychological
study of the strange situation. Hillsdale, NJ: Erlbaum.
American Institutes for Research, MDRC, MEF
Associates, and Child Trends. (2014). Head
Start professional development: Design options and considerations for an
evaluation of Head Start coaching, E. C. Howard & K. V. Drummond
(Eds.). Washington, DC: U.S. Department of Health and Human Services,
Administration for Children and Families, Office of Planning, Research and
Evaluation.
Berk, L. (2005). Infants and children (5th
ed.). Boston, MA: Pearson Education.
Bowlby, J. (1969). Attachment.
Attachment and loss: Vol. 1. Loss. New York, NY: Basic Books.
Bredekamp, S., and Copple, C. (Eds.) (2009). Developmentally appropriate practice in
early childhood programs: Serving children from birth through age 8 (3rd
ed.). Washington, DC: NAEYC.
Bretherton, I. (1992). The origins of attachment
theory: John Bowlby and Mary Ainsworth. Developmental
Psychology, 28, 759–775.
doi:10.1037/0012-1649.28.5.759
Bronfenbrenner,
U. (1979). The ecology of human development: Experiments by nature and
design. Cambridge, MA: Harvard University Press.
Bronfenbrenner, U. (2004). Making human beings human: Bioecological perspectives on human
development. Thousand Oaks, CA: Sage.
Center on the Developing Child at Harvard University.
(2014). Enhancing and practicing executive function skills with
children from infancy to adolescence. Retrieved from www.developingchild.harvard.edu.
Center on the Developing Child at Harvard
University. (2016). From best practices
to breakthrough impacts: A science-based approach to building a more promising
future for young children and families. Available at http://
www.developingchild.harvard.edu
Center on the Developing Child at Harvard University.
(n.d.). InBrief: The impact of early
adversity on children's development. Retrieved from http://developingchild.harvard.edu/index.php/resources/briefs/inbrief_series/inbrief_the_impact_of_early_adversity/
Center on the Developing Child at Harvard
University. (2011). Three core concepts
in early development [Video file]. Retrieved from https://www.youtube.com/watch?v=VNNsN9IJkws&list=PL0DB506DEF92B6347
Center on the Developing Child at Harvard
University. (2011). Building the brain’s “Air Traffic Control” system: How
early experiences shape the development of executive function: Working paper
no. 11. Retrieved from www.developingchild.harvard.edu
Center on the Developing Child at Harvard
University. (2012). The science of neglect: The persistent absence of
responsive care disrupts the developing brain: Working paper 12. Retrieved
from www.developingchild.harvard.edu
Center on the Developing Child at Harvard
University. (2014a). Inbrief: Early
childhood mental health. Retrieved from http://developingchild.harvard.edu/resources/briefs/inbrief_series/inbrief
Center on the Developing Child at Harvard
University. (2014b). Key concepts: Brain
architecture. Retrieved from http://developingchild.harvard.edu/key_concepts/brain_architecture/
Center on the Developing Child at Harvard
University. (2014c). Key concepts:
Executive function. Retrieved from http://developingchild.harvard.edu/key_concepts/executive_function/
Center on the Developing Child at Harvard
University. (2014d). Key concepts: Serve
and return. Retrieved from http://developingchild.harvard.edu/key_concepts/serve_and_return/
Center on the Developing Child at Harvard
University. (2014e). Key concepts: Toxic
stress. Retrieved from http://developingchild.harvard.edu/key_concepts/toxic_stress_response/
Clothier, S., Cohen, J., Onunaku, N., & Poppe, J.
(2005). Helping young children
succeed: Strategies to promote early childhood social and emotional development.
Washington, DC: Early Childhood Research and Policy Report to the National
Conference of State Legislatures.
Division for Early Childhood. (2014). DEC
recommended practices in early intervention/early childhood special education
2014. Retrieved from http://www.dec-sped.org/recommendedpractices
Early childhood assessment: What, why and how? A
report of the National Research Council of the National Academies. Retrieved from https://www.acf.hhs.gov/sites/default/files/opre/early_child_assess.pdf
NAEYC. (n.d.)
Early Head Start. (n.d.). School readiness: It’s all about
relationships. Retrieved from http://comfortconsults.com/blog/bid/265244/Early-Head-Start-School-Readiness-It-s-All-About-Relationships
Elkind, D. (2001). The hurried child: Growing
up too fast too soon (3rd ed.). Cambridge, MA: Perseus.
Faria, A.-M., Greenberg, A., DeSousa, J.-M.,
Hawkinson, L., Hamilton, E., & Scott, L. (2015). Quality rating and improvement systems (QRIS) in early childhood care
and education: Lessons learned from seven Midwest states. Chicago, IL:
Regional Educational Laboratory Midwest, American Institutes for Research.
Goossens, F., & van Ijzendoorn, M. (1990).
Quality of infants’ attachment to professional caregivers: Relation to
infant-parent attachment and day-care characteristics. Child
Development, 61, 832–837. doi:10.1111/j.1467-8624.1990.tb02825.x
Gonzalez-Mena, J., & Widmeyer Eyer, D.
(2001). Infants, toddlers, and caregivers (5th ed.). Mountain
View, CA: Mayfield.
Hanline, M. F., Wetherby, A., Woods, J., Fox, L.,
& Lentini, R. (2005). Positive beginnings:
Supporting young children with challenging behavior. Tallahassee, FL:
Positive Beginnings.
Harvard Health blog. Retrieved from https://www.health.harvard.edu/blog/resilience-a-skill-your-child-really-needs-to-learn-and-what-you-can-do-to-help-2017061311899
Heidemann, S., & Hewitt, D. (1992). Pathways
to play. St. Paul, MN: Redleaf Press.
Howard, E. (2015). What matters
most for children: Influencing inequality at the start of life. American
Institutes for Research. Retrieved from https://www.air.org/resource/what-matters-most-children-influencing-inequality-start-life
Jakobsen, I., Horwood, L. J., & Fergusson, D. M.
(2012). Childhood anxiety/withdrawal, adolescent parent-child attachment and
later risk of depression and anxiety disorder. Journal of Child & Family Studies, 21(2), 303–310.
doi:10.1007/s10826-011-9476-x
Landy, S. (2002). Pathways to competency:
Encouraging health social and emotional development in young children. Baltimore,
MD: Paul H. Brooks.
Lentini, R., Vaughn, B. J., & Fox, L.
(2004). Routine based support guide for
young children with challenging behavior. Retrieved from http://challengingbehavior.fmhi.usf.edu/do/resources/teaching_tools/toc/folder1/1e_routine_based.pdf
Lentini, R., Vaughn, B. J., & Fox, L.
(2008). Creating teaching tools for
young children with challenging behavior. Technical
Assistance Center on Social Emotional Intervention. Retrieved from http://challengingbehavior.fmhi.usf.edu/do/resources/teaching_tools/ttyc.htm
Main, M., & Solomon, J. (1986).
Discovery of a new, insecure-disorganized/disoriented attachment pattern. In T.
B. Brazelton & M. Yogman (Eds.), Affective
development in infancy (pp. 95–124). Norwood, NJ: Ablex.
McCarthy, C.
(2017, June 13). Resilience: A skill your child really needs to learn [web log
post]. Retrieved from https://www.health.harvard.edu/blog/resilience-a-skill-your-child-really-needs-to-learn-and-what-you-can-do-to-help-2017061311899
McLeod, S. (2008). Mary Ainsworth. Simply Psychology. Retrieved from http://www.simplypsychology.org/mary-ainsworth.html
Mendoza, J., Katz, L., Roberston, A. S.,
& Rothenburg, D. (2003). Connecting with parents in the early
years. Champaign: University of Illinois at Urbana-Champaign.
National Forum on Early Childhood Program
Evaluation. (2007). Early childhood program evaluations: A decision-maker’s
guide. Retrieved from http://www.developingchild.harvard.edu
National Scientific Council on the
Developing Child. (2008/2012). Establishing a level foundation for life:
Mental health begins in early childhood: Working paper 6 (Updated ed.).
Retrieved from http://www.developingchild.harvard.edu
National Association for the Education of Young Children (NAEYC). (2018). NAEYC early learning program accreditation standards and assessment items. Retrieved from https://www.naeyc.org/sites/default/files/globally-shared/downloads/PDFs/accreditation/early-learning/naeyc_early_learning_program_accreditation_standards_and_assessment_items_0.pdf
National Institute of Child Health and Human
Development (NICHD). (1997). The effects of infant child care
on infant-mother attachment security: Results of the NICHD study of early
childcare. Early Childcare Research Network. Child Development, 68,
860–879. doi:10.1111/j.1467-8624.1997.tb01967.x
National Research Council & Institute of
Medicine. (2000). From neurons to
neighborhoods: The science of early childhood development. Jack P. Shonkoff
and Deborah A. Phillips (Eds.). Washington, DC: National Academies Press.
National Scientific Council on the Developing Child.
(2014). Excessive stress disrupts the
architecture of the developing brain (Working Paper No. 3; Updated ed.).
Retrieved from http://developingchild.harvard.edu/index.php/resources/reports_and_working_papers/
working_papers/wp3/
NCECQA. (n.d.). About QRIS.
Retrieved from https://qrisguide.acf.hhs.gov/index.cfm?do=qrisabout
NIDA. (2016, March 9). Principles of substance abuse prevention for early childhood.
Retrieved from https://www.drugabuse.gov/publications/principles-substance-abuse-prevention-early-childhood
Onunaku, N. (2005). Improving maternal and
infant mental health: Focus on maternal depression. Los Angeles, CA: National Center for Infant
and Early Childhood Health Policy at UCLA.
Parlakian, P., & Seibel, N. L. (2002). Building
strong foundations, practical guidance for promoting the social-emotional
development of infants and toddlers. Washington, DC: Zero to Three Press.
Pawl, J. H., & Dombro, A. L. (2001). Learning and
growing together with families: Partnering with parents to support young
children’s development. Washington, DC: Zero to Three.
Pbworks. (n.d.). What
is early childhood social and emotional development? Retrieved from http://pelicbooks.pbworks.com/w/file/35671727/What%20Is%20Early%20Childhood%20Social%20and%20Emotional%20Development.doc
Petersen, S. (2012). Approaches to learning:
Supporting brain development for school success. Zero to Three, 33(1), 24–27.
Powers, S. (2012). From research to practice:
Strategies for supporting school readiness in programs serving infants and
toddlers. Zero to Three, 3(1), 37–42.
Retrieved from http://www.zerotothree.org/zttjournal/index-listing/sept-12-ednote-toc.pdf
listing/sept-12-ednote-toc.pdf
Powers, S. (2012a). Introduction. Zero to Three, 3(1), 2. Retrieved from http://www.zerotothree.org/zttjournal/index-
QRIS National Learning Network. (2015). QRIS state contacts & map. Retrieved
from http://qrisnetwork.org/sites/ all/files/maps/
Rogers, S., & Sawyers J. (1988). Play in
the lives of children. Washington, DC: NAEYC.
Sagi, A., Koren-Karie, N., Gini, M., Ziv, Y., &
Joels, T. (2002). Shedding further light on the effects of various types and
quality of early childcare on infant-mother attachment relationship: The Haifa
study of early childcare. Child Development, 73, 116–1186.
doi:10.1111/1467-8624.00465
Schaffer, H. R., & Emerson, P. E.
(1964). The development of social attachments in infancy. Monographs of the
Society for Research in Child Development, 29(3), 1–77. doi:10.2307/1165727
Snow, C. E.,
& Van Hemel, S. B. (Eds.). (2008). Early childhood assessment: What,
why and how? A report of the National Research Council of the National
Academies. Retrieved from https://www.acf.hhs.gov/sites/default/files/opre/early_child_assess.pdf
U.S. Census Bureau, Current Population Survey.
(2017). 2016 annual social and economic
supplement Tables POV01, POV03, POV13, POV21, POV40, and 3.
U.S. Census Bureau. (2017).
Poverty thresholds for 2016 by size of family and number of related children
under 18 years. U.S. Department of Health
and Human Services. https://www.census.gov/data/tables/time-series/demo/income-poverty/historical-poverty-thresholds.html
Vygotsky, L. S. (1978). Mind in society: The development of higher psychological processes (M.
Cole, V. John-Steiner, S. Scribner, & E. Souberman, Eds.). Cambridge, MA:
Harvard University Press.
Zeanah, C. H. (Ed.). (2009). Handbook
of infant mental health (3rd ed.). New York, NY: Guilford Press.
Zero to Three. (n.d.) From science to public policy: Promoting policies that support early
childhood emotional and social development. Retrieved from http://main.zerotothree.org/site/DocServer
/social_emotional_article_final.pdf?docID=1925
Zero to Three. (n.d.). Getting ready for school begins at birth. Retrieved from http://www.zerotothree
.org/child-development/social-emotional-development/gettingreadyforschoolbeginsatbirth.pdf
Zero to Three. (n.d.). The school-ready child [Infographic]. Retrieved from http://www.zerotothree
.org/public-policy/school-readiness-infographic.html
Zero to Three. (2005). Diagnostic classification
of mental health and developmental disorders of infancy and early childhood (Revised edition). Washington, DC:
Zero to Three Press. Retrieved from http://www.zerotothree.org/
Zigler, E., Singer, D., & Bishop-Josef, S.
(Eds.). (2004). Children’s play: The roots of reading. Washington,
DC: Zero to Three Press.
10 effective DAP teaching strategies. Retrieved
from https://www.naeyc.org/sites/default/files/globally-shared/downloads/PDFs/resources/topics/inforgraphic_DAP_2%202.pdf
RESOURCES:
American Academy of Pediatrics (http://www.aap.org)
American Institute
for Research (https://www.air.org/)
Centers for Disease
Control and Prevention website (www.cdc.gov)
Center for Parent Information and Resources (http://www.parentcenterhub.org/)
Center on the Developing Child at Harvard
University (https://developingchild.harvard.edu/)
Child Welfare Information Gateway (https://www.childwelfare.gov/)
Council for Exceptional Children (http://www.cec.sped.org)
Early Learning
Challenge Technical Assistance (ELCTA) Program (https://elc.grads360.org/#program)
Every Student
Succeeds Act (ESSA) (https://www.ed.gov/essa?src=ft)
Global Family
Research Project (https://globalfrp.org/)
High/Scope Educational Research Foundation (http://www.highscope.org)
National Association for the Education of Young
Children (http://naeyc.org)
National Association of Counsel for Children (http://www.naccchildlaw.org/)
National Center on Accessible
Educational Materials (http://aem.cast.org/)
National Center on Early
Childhood Quality Assurance
(https://qrisguide.acf.hhs.gov/)
National
Child Traumatic Stress Network (http://www.nctsn.org/)
National Early Childhood Technical Assistance
Center (http://www.nectac.org)
Quality
Rating and Improvement System (QRIS) (https://qrisguide.acf.hhs.gov/)
Technical
Assistance Center on Social-Emotional Intervention for Young Children (http://challengingbehavior.fmhi.usf.edu/)
U.S.
Department of Education-Early Learning (https://www2.ed.gov/about/inits/ed/earlylearning/index.html)
Vort
Corporation (http://www.vort.com)
Zero
to Three Organization (http://www.zerotothree.org)
Course content is updated every three
years. Due to this update timeline, some URL links may no longer be active or
may have changed. Please type the title of the organization into the command
line of any Internet browser search window and you will be able to find whether
the URL link is still active or any new link to the corresponding
organization's web home page.
Updated 11/14/19 JN