These "hills and valleys" (gyri and sulci) start to form around week 28 and become more prominent over time. The cortex, a sheet of cells only 2 mm thick, expands greatly in surface area, and becomes wrinkled and folded inside the skull. There is a major structural change occurring at this time. Play the animation and watch the rapid growth of the cerebral cortex during prenatal brain development.īy the 28th week after conception, the birth of new brain cells is largely complete, but the cerebral cortex continues to expand throughout the fetal period due mostly to the proliferation of dendrites, axons, and the support cells of the brain (e.g., glial cells). At this point, the cortex is a relatively thin and smooth sheet of densely packed neurons. The most dramatic changes involve the cerebral cortex, which enlarges and rapidly covers the midbrain by 6 months after conception. Whereas the embryonic period is the time when most body and brain structures emerge, the fetal period is the time when organs enlarge and mature. Prenatal development begins with conception, and it is divided into three periods: germinal (0-2 weeks), embryonic (3-8 weeks), and fetal (9-38 weeks). But like all other organs, the brain starts out as a much simpler collection of cells in the first days of development after conception. Researchers estimate that a baby's brain contains about 100 billion neurons, with over 100 trillion (100,000,000,000,000) synaptic connections. The brain is an organ of astonishing complexity in its function and structure. More than that, it embodies all that is the self: the memories, dreams, and characteristic ways of thinking that make each person unique. The brain is at the center of our thoughts, emotions, and behavior. School used them to be used for human guinnie pigs= exposed to radiation in oatmeal in nutrition study for quaker oaks only part of science club special treat to get in group
Solitary confindment and stripped naked cause you ran away Kids urinate in a bucket and throw it in your face, sexual abuse as well Red cherry day= sit all in circle, call you up, pull your pant and underpants and they would hit you with a branch till it was red like a cherry He cut up brains of severly retarted to be studied They didn't have to look for homes for youģ6 children slept in each room and little education, could be there for lifeģ0% of kids admitted had normal intelligence to work They thought they were not supposed to be born and part of this specie.Įugenics movement idea was to seperate people that were viewed as genetically inferrior from the rest of society to prevent them from reproducing.įairs were what started it good for america After reading the descriptions of the studies, your task is to identify the flaw.Ģ,500 confined at a time most were children all were called feeble-minded whether they were or not. The following pages contain brief descriptions of three studies, each with a major methodological flaw. Now, we are ready to test your knowledge. With this procedure, neither the participants nor the researchers who collect the data know in which group any particular participant is. A preferred approach is to use a double-blind procedure. They might, for example, treat the groups differently or score people's behavior differently because they expect the groups to differ. Another example of an influence might be if the researchers who interact with the participants are aware of which participants are in the experimental group and which ones are in the control group, they may inadvertently influence the results of the experiment. For example, if participants know which group (either control or experimental) that they have been assigned to, their expectations about the treatment might influence their behavior. How much control researchers actually have over their experiments is debatable.
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