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All the characteristics and abilities a person acquires and all developmental changes result from two basic, though complex, processes: learning and maturation. Since the two processes almost always interact, it is difficult to separate their effects from each other or to specify the relative contribution of each to a child’’s development. Clearly, growth in height is not learned but depends on maturation, a biological process. But improvements in motor activities such as walking, depend on maturation and learning, and the interaction between them.   What, then, are maturation and learning Developmental psychologists are not entirely in agreement, though there is a common core of accepted meaning. Thus all definitions of maturation stress organic processes or structural changes occurring within an individual’’s body that are relatively independent of external environmental conditions, experiences, or practice. By maturation it is meant development of the organism as a function of time, or age.   Learning has also been defined in diverse ways, but the term generally refers to changes in behavior or performance as a consequence of experience. Learning is the process by which an activity originates or is changed through training procedures as distinguished from changes not attributable to training.   A number of important and stimulating theories of learning have been proposed, each with its own set of principles and hypotheses for explaining the learning process. For our purposes, we do not need to be concerned with the specific details of the learning process, even though learning plays the most important role in most aspects of development and change. We shall employ only a few generally accepted principles of learning in this discussion.   Specifically, we accept the principle that a child will learn a response more effectively and more thoroughly if he is motivated to learn it. Moreover, he will learn a response better if he is rewarded for learning it. According to this view, the more a response is rewarded, the stronger it becomes and the more likely it is to be repeated. Although most learning involves motivation and reward, I believe some learning does occur without them.   As for the interrelationships between maturation and learning process, a general principle may be provided: maturation is essential to learning. The subject discussed in the text mainly belongs to the realm of

A. psychological biology.
B.developmental psychology.
C.biological psychology.
D.evolutional physiology.
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In less than 30 years’’ time the Star Trek holodeck will be a reality. Direct links between the brain’’ s nervous system and a computer will also create full sensory virtual environments, allowing virtual vacations like those in the film Total Recall. 71. There will be television chat shows hosted by robots, and cars with pollution monitors that will disable them when they offend. 72. Children will play with dolls equipped with personality chips, computers with in-built personalities will be regarded as workmates rather than tools, relaxation will be in front of smell-television,and digital age will have arrived. According to BT’’ s futurologist, Ian Pearson, these are among the developments scheduled for the first few decades of the new millennium (a period of 1,000 years ), when supercomputers will dramatically accelerate progress in all areas of life. 73.Pearson has pieced together the work of hundreds of researchers around the world to produce a unique millennium technology calendar that gives the latest dates when we can expect hundreds or key breakthroughs and discoveries to take place. Some of the biggest developments will be in medicine, including an extended life expectancy and dozens of artificial organs coming into use between now and 2040. Pearson also predicts a breakthrough in computer-human links. By linking directly to our nervous system, computers could pick up what we feel and, hopefully, simulate feeling too so that we can start to develop full sensory environments, rather like the holidays in Total Recall or the Star Trek holodeck, he says. 74. But that, Pearson points out, is only the start of man-machine integration: It will be the beginning of the long process of integration that will ultimately lead to a fully electronic human before the end of the next century. Through his research, Pearson is able to put dates to most of the breakthroughs that can be predicted. However, there are still no forecasts for when faster-that-light travel will be available, or when human cloning will be perfected, or when time travel will be possible. But he does expect social problems as a result of technological advances. A boom in neighborhood surveillance cameras will, for example, cause problems in 2010, while the arrival of synthetic lifelike robots will mean people may not be able to distinguish between their human friends and the droids. 75. And home appliances will also become so smart that controlling and operating them will result in the breakout of a new psychological disorder--kitchen rage.