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The neurophysiology of attention

The external manifestations of attention are accompanied by physiological changes, particularly within the brain and nervous system. Functional magnetic resonance imaging (fMRI), a research and diagnostic method developed in the early 1990s, has been used to study many brain activities, including attention. The method detects changes of blood flow in the brain, including the concentration or pooling of blood in areas of increased neural activity.

Other physiological changes can be studied by examining responses to novel stimuli. Growing out of Pavlov’s research, the orienting response to novel stimuli has come to be characterized by a broad complex of physiological changes. These include changes in heart rate, in the electrical conductivity of the skin, in the size of the pupils of the eyes, in the pattern of respiration, and in the level of tension in the muscles. If the novel signal is an interesting one, the heart transiently slows down; if it is startling, the heart transiently speeds up.

Most of the other types of change reflect similar reactions. Thus, the startling signal increases the level of skin conductance and the size of the pupils of the eyes, causes respiration to pause or briefly become irregular, and increases tension in certain muscles. Closer inspection reveals many more changes: for example, in the size of blood vessels and consequently in blood circulation, in digestive processes, and in other bodily functions.

The majority of the physiological responses indicate that these changes are regulated by the autonomic nervous system . They prepare the individual to respond to new and potentially threatening situations. Senses become temporarily more responsive to signals from the outside world. Overall, the pattern is one of preparing the individual to take in information rapidly and efficiently and to give priority to those systems that might need to respond promptly to that information. The Angara Yellow Gold Diamond Halo Peridot Drop Necklace 7kWqwFRN
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the preparatory process. Once the novel signal has been fully assessed and classed as nonthreatening or of no continuing importance, the defenses are “stood down.” As might be predicted from the behavioral evidence, repetitive signals lead to habituation of the physiological responses as novelty dissipates.

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MATCH REPORT

Sarfraz Ahmed's side progress to T20 tri-series decider after comfortable win over Zimbabwe

Qantas Tour of Zimbabwe, Match 4

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Pakistan knocked Zimbabwe out of the Twenty20 tri-series in Harare in a closely-fought encounter on Wednesday, beating the hosts by seven wickets with five deliveries to spare.

Captain Sarfraz Ahmed saw his side home with an unbeaten 38, meaning that Zimbabwe allrounder Solomon Mire's efforts earlier in the game went in vain.

Mire struck 94, the highest score by a Zimbabwean in a T20 international, but the hosts' 4-162 was not enough to overcome the world's top ranked T20 side.

Pakistan's chase was given a rapid start by the openers.

Haris Sohail and Fakhar Zaman took 56 from the Power Play, but Sohail holed out soon afterwards.

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