Rods are very sensitive to light, shapes and movements and cones are not as sensitive, but they control the perception of color.
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But is the amount of control worth the perception that the system is obtusely anti-consumer?
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Given my analytic bent, I was intrigued that one of the strongest factors in the statistical model between peer social support and mortality was the perception of control.
Professor and researcher Richard Dekmejian thinks both Sunni insurgents and radical foreign Islamists are united in their belief that the US wants long-term control of Iraq, a perception, he says that fuels the insurgency.
Markets will also benefit from any perception that the Democrats will lose control of at least the House of Representatives.
The perception that in some areas police had lost control of the streets was the most important reason disorder spread, it said, adding that flooding the streets with officers was what ultimately quelled the disorder.
It can give you a sense of control, of purpose, it can shake up your perception of time, offer the space to expand cultural horizons and allow the kind of relaxed break everyone needs to refuel.
He has seen his ratings among Colombians drop in recent weeks because of the widespread perception that the security situation has gotten out of control during his leadership.
The effect of this perception is to intensify pressure for expeditious completion of strategic and conventional arms control accords.
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For decades, the gender perception of entrepreneurs is male- risk taker, ambitious, high locus of control, successful.
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It reflects a fundamental principle of risk perception: that people are far more fearful of things they don't control than things they do.
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