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Human Development. Part 1: Genetics and infancy. PSYCHOLOGY (8th Edition) David Myers. PowerPoint Slides Mr. Mable Tucker High School 2009. Developing Through the Life Span and Genetics Chapter 3&4. Developmental Psychology. Studies Lifespan Development

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human development

Human Development

Part 1: Genetics and infancy

psychology 8th edition david myers

PSYCHOLOGY(8th Edition)David Myers

PowerPoint Slides

Mr. Mable

Tucker High School

2009

developmental psychology
Developmental Psychology
  • Studies Lifespan Development
  • From the “Cradle to the Grave” or from the “Womb to the Tomb.”
  • What changes occur?
  • How do we reduce Negative effects?
developmental issues
Developmental Issues

Continuity and Stages

Researchers who view development as a slow, continuous process are generally those who emphasize experience and learning. Biologists, on the other hand, view maturation and development as a series of genetically predisposed steps or stages. These include psychologists like Piaget, Kohlberg and Erikson.

developmental issues6
Developmental Issues

Stability and Change

Lifelong development requires both stability and change. Personality gradually stabilizes as people age. However, this does not mean that our traits do not change over a lifetime. Some temperaments are more stable than others.

nature vs nurture issue
Nature vs. Nurture Issue
  • Nature - Heredity & Genetics
  • Nurture - Environmental Influences
  • Twin Studies are used to determine which is influencing our behavior. Longitudinal & Cross-sectional studies are also used.
genetic basics
Genetic Basics
  • Each Parent contributes 23 Chromosomes
  • A Human has a total of 46 Chromosomes
  • Each Chromosome contains DNA
  • Genotype (Underlying Trait)
  • Phenotype (Observable Trait)
  • Dominant vs. Recessive Genes
developing through the life span
Developing Through the Life Span

Prenatal Development and the Newborn

  • Conception
  • Prenatal Development
  • The Competent Newborn

Infancy and Childhood

  • Physical Development
  • Cognitive Development
prenatal development and the newborn
Prenatal Development and the Newborn

How, over time, did we come to be who we are? From zygote to birth, development progresses in an orderly, though fragile, sequence.

conception
Conception

A single sperm cell (male) penetrates the outer coating of the egg (female) and fuses to form one fertilized cell.

Lennart Nilsson/ Albert Bonniers Publishing Company

Lennart Nilsson/ Albert Bonniers Publishing Company

prenatal development
Prenatal Development

A zygote is a fertilized cell with 100 cells that become increasingly diverse. At about 14 days the zygote turns into an embryo (a and b).

Lennart Nilsson/ Albert Bonniers Publishing Company

Biophoto Associates/ Photo Researchers, Inc.

prenatal development16
Prenatal Development

At 9 weeks, an embryo turns into a fetus (c and d). Teratogens are chemicals or viruses that can enter the placenta and harm the developing fetus.

Lennart Nilsson/ Albert Bonniers Publishing Company

Lennart Nilsson/ Albert Bonniers Publishing Company

prenatal risks
Prenatal Risks

Teratogens – Poisons that can pass through the Placenta

  • Radiation
  • Toxic Industrial Chemicals (Mercury)
  • Diseases: Rubella, AIDS, Herpes, Syphallis
  • Drugs: Alcohol, Cocaine, Heroin
  • Fetal Alcohol Syndrome & Birth Defects
down s syndrome
People with Down syndrome have an extra copy of chromosome 21, or part of it. They suffer a mild mental retardation Down’s Syndrome
symptoms of fas
Symptoms of FAS
  • low birth weight
  • small head circumference
  • failure to thrive
  • developmental delay
  • organ dysfunction
  • facial abnormalities, epilepsy
  • poor coordination/fine motor skills
  • poor socialization skills,
  • lack of imagination or curiosity
  • learning difficulties
  • behavioral problems
  • Hyperactivity
  • inability to concentrate,
tay sachs disease
Tay-Sachs Disease
  • Deterioration of the Central Nervous System
  • Defective enzyme (hexosaminidase A)
  • Recessive Gene (Genetic Disorder)
  • 1/3500 (common in Ashkenazi Jews)
turner s syndrome
Turner’s Syndrome
  • Turner’s Syndrome
  • Caused by a single X-chromosome.
klinefelter s syndrome
47 XXY

Caused by and

extra X chromosome

in males

1 out of 1,000 live male births

Klinefelter’s syndrome
phenylketonuria
Phenylketonuria
  • PKU
  • Brain fails to develop in Infancy
  • Defective Enzyme (phenylalanine hydroxylase)
  • Recessive Gene
  • 1/12,000
cystic fibrosis
Cystic Fibrosis
  • Mucus clogs lungs, liver, and pancreas
  • Failure of chloride ion transport system
  • Recessive Gene
  • 1/2500 (Caucasians)
  • Results in premature death
sickle cell anemia
Sickle Cell Anemia
  • Poor blood circulation
  • Abnormal Hemoglobin molecules
  • Recessive Gene
  • 1/625 (African Americans)
hemophilia
Hemophilia
  • Blood fails to clot
  • Defective blood clotting factor VII
  • Sex Linked Recessive Gene
  • 1/10,000 (males)
huntington s disease
Huntington’s Disease
  • Brain tissue gradually deteriorates in middle age
  • Production of an inhibitor of brain cell metabolism
  • Dominant Gene
  • 1/24,000
  • Results in death
muscular dystrophy
Muscular Dystrophy
  • Muscles waste away
  • Degradation of myelin coating on nerves stimulating muscles
  • Sex-Linked Recessive Gene
  • 1/3700 (Males)
stages of life chart
Stages of Life Chart

Prenatal:

  • Conception
  • Zygote
  • Embryo
  • Fetus
  • Birth
stages of life chart32
Stages of Life Chart
  • Infancy (Birth to 2 years old)
  • Childhood (2 through puberty)
  • Adolescence (Puberty to 20)
  • Young Adulthood (20 to 40)
  • Middle Adulthood (40 to 60)
  • Late Adulthood (60 to 80+)
infancy

INFANCY

Birth to 2 years Old

physical development children
Physical Development- Children
  • Very poor eyesight at birth (visual cliff)
  • Cephalocaudal Development (head to toe)
  • Brain is only 25% of adult size & lbs.
  • Dendrites & neural connections must increase & Myelin must grow creating faster, more coordinated movements.
infant reflexes
Infant Reflexes
  • Babinski Response - fanning out of toes as sole of foot is stroked
the competent newborn
The Competent Newborn

Infants are born with reflexes that aid in survival to locate food.

  • Sucking- occurs when lips are touched
  • Rooting- turning head as cheek is touched
infant reflexes37
Infant Reflexes
  • Grasping- when palm is touched
  • Moro - Startle reflex : arching back with flailing of arms & legs
cognitive development in the newborn
Cognitive Development in the Newborn

Investigators study infants becoming habituated to objects over a period of time. Infants pay more attention to new objects than habituated ones, which shows they are learning.

infancy and childhood
Infancy and Childhood

Infancy and childhood span from birth to the teenage years. During these years, the individual grows physically, cognitively, and socially.

physical development
Physical Development

Infants’ psychological development depends on their biological development. To understand the emergence of motor skills and memory, we must understand the developing brain.

THE JOB OF CHILDREN IS TO PLAY!!!!

developing brain
Developing Brain

The developing brain overproduces neurons. Peaking around 28 billion at 7 months, these neurons are pruned to 23 billion at birth. The greatest neuronal spurt is in the frontal lobe enabling the individual to think rationally.

maturation
Maturation

The development of the brain unfolds based on genetic instructions, causing various bodily and mental functions to occur in sequence— standing before walking, babbling before talking—this is called maturation.

Maturation sets the basic course of development, while experience adjusts it.

motor development
Motor Development

First, infants begin to roll over. Next, they sit unsupported, crawl, and finally walk. Experience has little effect on this sequence.

Renee Altier for Worth Publishers

Phototake Inc./ Alamy Images

Profimedia.CZ s.r.o./ Alamy

Jim Craigmyle/ Corbis

maturation and infant memory
Maturation and Infant Memory

The earliest age of conscious memory is around 3½ years (Bauer, 2002). A 5-year-old has a sense of self and an increased long-term memory, thus organization of memory is different from 3-4 years.

Courtesy of Carolyn Rovee-Collier

Amy Pedersen

cognitive development
Cognitive Development

Piaget believed that the driving force behind intellectual development is our biological development amidst experiences with the environment. Our cognitive development is shaped by the errors we make.

Both photos: Courtesy of Judy DeLoache

schemas
Schemas

Schemas are mental molds into which we pour our experiences.

assimilation and accommodation
Assimilation and Accommodation

The process of assimilation involves incorporating new experiences into our current understanding (schema). The process of adjusting a schema and modifying it is called accommodation.

Bill Anderson/ Photo Researchers, Inc.

Jean Piaget with a subject

sensorimotor stage
Sensorimotor Stage

In the sensorimotor stage, babies take in the world by looking, hearing, touching, mouthing, and grasping. Children younger than 6 months of age do not grasp object permanence, i.e., objects that are out of sight are also out of mind.

Doug Goodman

sensorimotor stage criticisms
Sensorimotor Stage: Criticisms

Piaget believed children in the sensorimotor stage could not think —they do not have any abstract concepts or ideas.

However, recent research shows that children in the sensorimotor stage can think and count.

  • Children understand the basic laws of physics. They are amazed at how a ball can stop in midair or disappear.
sensorimotor stage criticisms52
Sensorimotor Stage: Criticisms

2. Children can also count. Wynn (1992, 2000) showed that children stared longer at the wrong number of objects than the right ones.

preoperational stage
Preoperational Stage

Piaget suggested that from 2 years old to about 6-7 years old, children are in the preoperational stage—too young to perform mental operations… Characterized by one-dimensional thinking

Ontario Science Center

preoperational stage criticism
Preoperational Stage: Criticism

DeLoache (1987) showed that children as young as 3 years of age are able to use metal operations. When shown a model of a dog’s hiding place behind the couch, a 2½-year-old could not locate the stuffed dog in an actual room, but the 3-year-old did.

egocentrism
Egocentrism

Piaget concluded that preschool children are egocentric. They cannot perceive things from another’s point of view.

When asked to show her picture to mommy, 2-year-old Gabriella holds the picture facing her own eyes, believing that her mother can see it through her eyes.

theory of mind
Theory of Mind

Preschoolers, although still egocentric, develop the ability to understand another’s mental state when they begin forming a theory of mind.

The problem on the right probes such ability in children.

concrete operational stage
Concrete Operational Stage

In concrete operational stage, given concrete materials, 6- to 7-year-olds grasp conservation problems and mentally pour liquids back and forth into glasses of different shapes conserving their quantities.

Children in this stage understand conservation and can think in TWO Dimensions

formal operational stage
Formal Operational Stage

Around age 12, our reasoning ability expands from concrete thinking to abstract thinking. We can now use symbols and imagined realities to systematically reason. Piaget called this formal operational thinking.

formal operational stage61
Formal Operational Stage

Rudiments of such thinking begin earlier (age 7) than what Piaget suggested, since 7-year-olds can solve the problem below (Suppes, 1982).

If John is in school, Mary is in school. John is in school. What can you say about Mary?

reflecting on piaget s theory
Reflecting on Piaget’s Theory

Piaget’s stage theory has been influential globally, validating a number of ideas regarding growth and development in many cultures and societies. However, today’s researchers believe the following:

  • Development is a continuous process.
  • Children express their mental abilities and operations at an earlier age.
  • Formal logic is a smaller part of cognition.
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