With the increase in the number of such advertisements, however, each advertiser within a certain group is competing with others in the same group for the readers attention,故选项D正确。 Psychologists take opposing views of how external rewards, from warm praise to old cash, affect motivation and creativity. Behaviorists, who study the relation between actions and, argue that rewards can improve performance at work and school. Some other researchers who study various aspects of mental life, maintain those rewards often destroy creativity by encouraging dependence on approval and gifts from others.
The latter view has gained many supporters, especially among educators. But the careful use of small monetary rewards sparks in grade-school children suggesting that properly presented inducements indeed aid inventiveness, according to a study in the June Journal Personality and Social Psychology.
If they know they re working for a reward and can focus on a relatively challenging task, they show the most creativity, says Robert Esenberger of the University of Delaware in Newark. But it s easy to kill creativity by giving rewards for poor performance or creating too much anticipation for rewards.
A teacher who continually draws attention to rewards or who hands out high grades for ordinary achievement ends up with uninspired students, Esenberger holds. As an example of the latter point, he notes growing efforts at major universities to tighten grading standards and restore falling grades.
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