Presentation on theme: "Taylor Brackner Davis Faulkner Nicole White Jake Martin."— Presentation transcript:
Taylor Brackner Davis Faulkner Nicole White Jake Martin
Studying The Brain Case Studies involve the thorough investigation of a single person or small group of people. Brain damage has provided insight into behavior such as memory, speech, emotions, movement, and personality.
Lesions lesions—surgically altering, removing, or destroying specific portions of the brain—and observing subsequent behavior.
Electrical Stimulation Involves implanting bipolar electrodes in a specific brain area. Electrical stimulation causes activation of the neurons in the area around the tip of the electrode and usually produces the opposite behavioral effect of a lesion in the same brain area. A graphic record of the brain’s electrical activity is called a electroencephalogram(EEG)
The Developing Brain 3 weeks after conception, sheet of primitive neural cells has formed Sheet curls to make the hollow neural tube Neural tube lined with neural stem cells Stem cells are cells that can divide indefinitely
Neural Tube Top of the neural tube thickens into three bulges Hindbrain Midbrain Forebrain As the neural tube expands, develops cavities called ventricles Found at the core of fully developed brain
During peak periods of brain development, new neurons are being generated at 250,000/ minute Triggered by chemical signals and guided by the fibers of specific glial cells, the newly born neurons travel to other parts of the brain About halfway through the prenatal period the production of new brain cells is virtually complete
After specific neurons are differentiated, they begin to develop the nervous system The development of dendrites and synapses begins before birth and continues throughout lifespan Fetal brain forms as many as 2 million synaptic connections/second By the end of fetal development, the forebrain structures eventually come to surround and envelop the hindbrain and midbrain structures
At birth, the infant’s brain is only about ¼ the size of an adult brain Less than a pound After birth, dendrites are formed as the neurons grow in size Axons grow longer an the branching at the ends of the axons become more dense A fully developed adult brain weighs about 3 pounds
neurogenesis the process where neurons are generated from stem cells most active during pre natal development “birth of neurons” hippocampus, the part of the brain that plays a central role in the ability to form new neurons. It effects the ability and rate of learning new information. Neurogenesis is also believed to play a roll in the regulation of stress through the production of antidepressants. Neurogenesis continues into ages as old as 70