It is implicated in stress response. AFFERENT – Carrying information towards a particular group of neurones (compare efferent*). AGONIST – A neurotransmitter or a drug which binds to a receptor and triggers a cascade of intracellular signalling leading to changes in the membrane potential. AMINO ACID – A chemical made of carbon, oxygen, hydrogen and nitrogen, which is a building unit of all proteins* and other biologically important substances. AMINO ACID NEUROTRANSMITTERS – A group of fast acting neurotransmitters* which includes glutamate (excitatory) and GABA (gamma-amino butyric acid, inhibitory). AMNESIA – Loss of memory. AMYGDALA – A structure in the forebrain which is a component of the limbic* system. It is implicated in control of emotions. ANTAGONIST – A chemical which blocks receptors* and stops (inhibits) the effects of agonists*. ANTERIOR – Towards the front, e.g. anterior cingulate cortex – frontal part of the
Spending increasing amounts of time and money on hardware, software, magazines, and computer-related activities. Neglecting work, school, or family obligations. Lying about the amount of time spent on computer activities. Risking loss of career goals, educational objectives, and personal relationships. Failing at repeated efforts to control computer use. Never getting off the computer. A cause for many of the above-mentioned effects may be that computer games do not stimulate the release of neurotransmitters responsible for feelings of satisfaction and relaxation, such as oxytocin and endorphin, in the same way that real world activities do.
Of those, just over 3 million, or 13 percent, smoke cigarettes. In the U.S., 66.5 million people, or about 29 percent of the population, use tobacco. With each puff of a cigarette, a smoker pulls nicotine into his or her lungs where it is absorbed into the blood. In eight seconds, nicotine is in the brain, changing the way the brain works. This process happens so fast because nicotine is shaped like the natural brain chemical acetylcholine. Acetylcholine is one of many chemicals called neurotransmitters that carry messages between brain cells. Neurons have special spaces called receptors, into which specific neurotransmitters can fit, like a key fitting into a lock. Nicotine locks into acetylcholine receptors in different parts of the brain, rapidly causing changes in the body and brain. Nicotine raises the heart rate and respiration (breathing) rate, and causes more glucose, or blood sugar, to be released into the blood. This might be why smokers feel more alert after smoking a cigarette.
Psychology Gleitman Blood flow in the brain during different activities: the rate of blood flow is measured by special radiation counters that are placed at various points of the skull and that monitor radiation from mildly radioactive gas injected into the bloodstream. Blood flow pattern depends on what the patient does ( different pattern is found when person is reading aloud, yet another when he watches a moving light and so on). Ambiguous sights and sounds: The way ambiguous figures are perceived often depends on what we have seen just before. For example, if we are first shown an unambiguous figure of a rat, the ambiguous picture will be seen as a rat. If we are first exposed to an unambiguous face, we see the ambiguous figure as a face. What holds for visual patterns also holds for language. Many utterances are ambiguous. If presented out of context, they can be undestrood in several different ways. For exam...
experiments by Rosenzweig and Bennett. Neurotransmission experiment by Martinez and Kesner. 4) Case studies: Phineas Gage studied by Dr John Harlow and Oliver Sack's study on Dr P. Discuss how and why particular research methods are used at the biological level of analysis. Biological researchers often adopt a reductionist approach to the study of human behavior. They work on a micro-level of research, breaking down complex behavior into its smallest parts (e.g. genes, neurotransmitters or proteins). This approach is sometimes criticized for being overly simplistic, but it is important to have detailed information of the components of human behavior in order to understand the interaction of several factors. Kasamatsu and Hirai studied a group of Buddhist monks who went on a 72-hour pilgrimage to a holy mountain in Japan. During this time the monks did not eat, drink or speak and were exposed to cold, autumn weather. About 48 hours later they started
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