The psychologists David Dunning of Cornell University and Emily Balcetis University of New York, seems to have found.

Experts believe this may be an adaptive mechanism that dissipates the desire to invest energy in what we do not like, but it increases the interest to go for what attracts us.

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In the experience, psychologists first studied appealing feel that you have in relation to the distance where the object is. They asked 90 university students, whose fifty percent had eaten a pack of crackers, while the rest had not eaten anything, which calculates the distance between your location and a bottle of water. The average set of students was 71 inches for those who do not feel thirsty, but 63 inches for that if they felt the urge to drink water, as a result of eating crackers.

Then, they were asked, the two groups, which calculates the estimated distance between them and an object representing a direct interest, they could get a ticket, a hundred dollars, and another that had no direct interest, a ticket, the same value that was owned by someone else.

As had been established on previous experience, the mood of the people affects some aspects of what is perceived, the two groups of students carried out an exercise to assess their mood.

As in the first experiment, young people felt that the things that aroused most interest were less distance than the objects that were not caught his attention, but it was found that mood did not influence the perception of remoteness.

The conclusions of these experiences speak of a sense from an evolutionary standpoint. What this fence is easier to take than distant objects. Therefore, the sense of believing that an object necessary or useful to survive is closer to its actual distance, motivates even more the desire to go in your search.