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Human organs and organ systems develop in a process known as organogenesis. This begins in the third week of embryonic development, when the gastrula forms three distinct germ layers, the ectoderm, mesoderm and endoderm. The ectoderm will eventually develop into the outer layer of skin and nervous system.
This field examines change [2] across three major dimensions, which are physical development, cognitive development, and social emotional development. [3] [4] Within these three dimensions are a broad range of topics including motor skills, executive functions, moral understanding, language acquisition, social change, personality, emotional ...
Erik Erikson and Carl Jung proposed stage theories [2] [3] of human development that encompass the entire life span, and emphasized the potential for positive change very late in life. The concept of adulthood has legal and socio-cultural definitions. The legal definition [4] of an adult is a person who is fully grown or developed.
When an aspect of development is strongly affected by early experience, it is said to show a high degree of plasticity; when the genetic make-up is the primary cause of development, plasticity is said to be low. [60] Plasticity may involve guidance by endogenous factors like hormones as well as by exogenous factors like infection. [57]
Physical development. Typically grows between 0.5 and 0.75 inches (1.3 and 1.9 cm) and gains between 1 and 1.25 pounds (450 and 570 g). [34] Motor development. Begins to sit without support of hands. [35] Able to support entire weight on legs. [35] Sensory development. Able to see in full color. [35]
In subsequent revisions, Bronfenbrenner acknowledged the relevance of biological and genetic aspects of the person in human development. At the core of Bronfenbrenner’s ecological model is the child’s biological and psychological makeup, based on individual and genetic developmental history.
Many theories of development have aspects of identity formation included in them. Two theories directly address the process of identity formation: Erik Erikson's stages of psychosocial development (specifically the Identity versus Role Confusion stage), James Marcia's identity status theory, and Jeffrey Arnett's theories of identity formation in emerging adulthood.
This theory consists of three main ideas that make up personality, the id, the ego, and the superego. The three traits control their own sections of the psyche. Personality is developed by the three traits that make up the Psychoanalytic theory conflicting. Id is ruled mainly by pleasure, innate needs, impulses, and desires.