1. Explain the major concepts of evolutionary theory, such as natural selection and variation. Charles Darwin created the theory of evolution and helped us to understand the roots of behavior and mental process. Natural selection states: variations increasing that odds of reproducing and surviving are most likely to be passed on to future generations, this has shaped our traits and behavior tendencies. Nature has selected advantageous variations from the mutations and new gene combo's produced at each human understanding. The genes selected during our ancestors history provide strong capacity to learn and adapt to life in varied environments.
2. Identify several methods used to study the brain and give a significant finding associated with each. Several methods used to study the brain with proved significant findings are the following:
lesions - the removal or destruction of part the brain, leaving surrounding tissue unharmed.
significant finding - damage to one area of the hypothalamus in a rat's brain reduces eating, causing the rat to starve unless force-fed.
• EEG (Electroencephalogram) - machine that measures brain waves by
electrodes placed on the scalp.
• significant finding - brain display of a 4-year-old who has epilepsy.
CT (computed tomography) - x-rays of brain, doesn't show brain function, also called a CAT scan.
significant finding - found a tumor in a 45-year-old mans brain.
PET (positron emission tomography) scan - patient usually swallows a substance (like glucose), therefore the PET scan can show parts of the brain using the substance.
• significant finding - after woman receives temporarily radioactive
glucose, PET scan detects where this "food for thought" goes by locating
MRI (magnetic resonance imaging) - uses magnetic fields & radio waves to produce computer-generated images of soft tissue, shows a...