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PSYA02H3 (931)
Chapter 12

Chapter 12 Notes

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University of Toronto Scarborough
Oren Amitay

Prenatal Development Prenatal period 9 months between conception and birth Factors direct the mechanisms of replication: 1) one of the 2 X chromosomes that women bear, most of its genes do not synthesize the proteins they normally would it limits the total amount of proteins produced by genes without this limit, the metabolism of a developing female would be very different from that of a developing male silenced chromosome is passed along to descendant cells A modification of cell inheritance that is not due to alterations of the DNA sequence itself 2) Epigenetic changes include the way the DNA molecule is folded within other proteins, chemical changes in the structure of the nucleotide cytosine, and complex modifications in the way DNA information is mapped into protein synthesis - cells chemical environment moderates the expression of its genetic code - wile the genetic information contained within the individual remains the same throughout development, the reproducing cells become specialized as blood cells, neurons, and muscle cells Stages of Prenatal Development Zygote stage (2 weeks) single new cell that is formed at conception, divides many times and the internal organs begin to form - the end of the 1 week the zygote consists of about a 100cells (2 layers) 1) skin, hair, nervous system, and sensory organs 2) digestive and respiratory systems ad glands - the end of this stage 3) muscles and the circulatory and excretory systems Embryonic stage (2 weeks 8 weeks after conception) the heart begins to beat - the brain starts to function, and most of the major body structures begin to form - the end of this stage the major human body (arm, finger, toe, eye) are defined - most susceptible to external chemical influences (alcohol, drugs) teratogens (Greet eras = malformation) any substance, agent, or event that can cause birth defects androgens the primary class of sex hormones in males (testosterone is most important); gennan means to produce - female sex organs does not need to be stimulated by a hormone Fetal Stage (7months) beginning with the appearance of bone tissue the end of 3 month show some movement(kicking) major organs, bones, muscles www.notesolution.com the end of 4 month sleeping and waking regularly - heartbeat is loud enough to be heard through stethoscope Threats to Normal Prenatal Development - teratogens cause birth defects tetracycline (a common antibiotic) cause irregularities in the bones and discoloration of the teeth Cocaine - an increased risk of premature birth, low birth weight, and a smaller-than-normal head circumference - consequences in the areas of arousal and attention - babies are born addicted and show withdrawal symptoms such as hyperactivity, irritability, tremors, and vomiting Cigarette(lower arousal levels) carbon monoxide reduces the supply of oxygen to the fetus harmful during last half of pregnancy (because it develops most rapidly and demand for oxygen) deficits to process speech sounds Alcohol (FAS) effects both pre- and postnatal growth deficits deformations of the eyes and mouth, low brain mass, other brain and central nervous system abnormalities, and heart deformation their physical and intellectual development still falls short of others Agricultural pollution organophosphorus pesticides had a much larger risk of damage to the chromosome structure of their sperm cells Physical and Perceptual Development in Infancy and Childhood Motor Development (nervous system and practice) - normal motor development is dictated by maturation of the muscles and the nervous system Maturation an relatively stable change in thought, behaviour, or physical growth that Is due to the aging process and not to experience - infants most important movements are reflexes: roo , sucking, and swallowing responses Perceptual Development Form Perception - visual perceptual abilities 1 month - babys gaze seems to be trapped by the edges 2 month baby scans across the border to investigate the interior of a figure 1 or 2 month babies dont perceive complete shapes; their scanning strategy is limited to fixations on a few parts of the object at which are looking 3 month clear signs of patter recognition (human face) 4 or 5 months discriminate between even very similar faces www.notesolution.com Distance Perception the ability to perceive 3D space - (retinal disparity) perception of depth occurs when the two images are fused through visual processing - stereopsis (solid vision) will not develop unless animals have experience viewing objects with both eyes during a period early in life - if eyes are crossed = same points on the two retinas receive the same information = no disparity and no depth perception through stereopsis Critical and Sensitive Periods in Perceptual Development Critical period a specific time in development during which certain experiences must occur for normal development to occur Sensitive period a period of time during which certain experiences have more of an effect on development than they would have if they occurred at another time e.g. second language is learned more easily in childhood than later Cognitive Development in Infancy and Childhood 12 months are able to form memories of specific events The Work of Jean Piaget Operation in Piagets theory, a logical or mathematical rule that transforms an object or concept into something else - Piaget proposed that schemata are first defined in terms of objects and actions but that later they become the basis of the concrete and abstract concepts that constitute adult knowledge Assimilation the process by which existing schemata are modified or changed by new experiences e.g. meets new children and adults, they will usually fit into his existing schemata Accommodation the process by which existing schemata are modified or changed by new experiences Piagets Four Periods of Cognitive Development Equilibration a process within Piagets theory that reorganizes schemata 1) Sensorimotor period (0-2) is marked by an orderly progression of increasingly complex cognitive development: reflexes, permanence, a rough approximation of causality, imitation, and symbolic thinking - during this period, cognition is closely tied to external stimulation object permanence the idea that objects do not disappear when they are out of sight (6 months) children lose all interest in an object that disappears from sight (thinking is doing) Last half of the 1st year look at an object form various angles - out of sight is no longer out of mind www.notesolution.com Early in the 2 year infants will search for an object in the last place they saw it hidden 2) Preoperational Period (age 2-7) 4-5 year transitional period between first being able to think symbolically and then being able to think logically - children become increasingly capable of speaking meaningful sentences - rapid development of language ability and of the ability to represent things symbolically - the child arranges toys in new ways to represent other objects - begins to classify and categorize objects, and starts learning to count and to manipulate numbers - Schemas are reorganized around words - words are symbols that have no physical resemblance to the concept they represent - Piaget referred to such abstract symbols as signs Egocentrism self-centredness; preoperational children can see the world only from their own perspective - childs schemas do not permit invertible operations - he believes that I have radically changed something about the pennies Conservation understanding that specific properties of objects (height, volume, length) remain the same despite apparent changes in the shape or arrangement of those objects 3) The Period of Concrete Operations (age 7-11) children come to understand the conservation principle and other concepts, i.e. categorization - emergence of the ability to perform logical analysis, by an increased ability to empathize with the feelings and attitudes of others, and by an understanding of more complex cause and-effect relations - they can answer a question with concrete objects but not hypothetical objects 4) The Period of Formal Operations individuals first become capable of more formal kinds of abstract thinking and hypothetical reasoning - understand that under different conditions, their behaviour can have different consequences - formal operational thinking is influenced by cultural variables, esp. schooling - not all people pass through all 4 stages and reach the formal operational period - in some cases, adults show formal operational thought only in their areas of expertise Evaluation of Piagets Contributions www.notesolution.com
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