Walter has been working at his computer for the past 2 hours and the hum that he found so annoying when he started no longer bothers him. The change in Walter’s sensitivity to the noise from the computer illustrates the principle of:

sensory adaptation            

Explanation:

Sensory adaptation is described as a phenomenon in which an individual experience a reduction in the 'sensitivity' that is being related to a specific stimulus after he or she is being exposed to it constantly. Because sensory adaptation is capable of reducing an individual's awareness related to a specific and a constant stimulus, however, it is responsible for freeing up his or her resources and attention in order to attend to some other stimuli in the surrounding environment around him or her.

The given statement represents 'sensory adaptation.

- "sack of constantinople, (april 1204). the diversion of the fourth crusade from the holy land to attack, capture, and pillage the byzantine city of constantinople divided and dissipated the efforts of the christians to maintain the war against the muslims. the fourth crusade was corrupted from its purpose early on."

- "the crusades were a series of religious wars undertaken by the latin church. the first crusade arose after a call to arms in 1095 sermons by pope urban ii. the first crusade unleashed a wave of impassioned, pious catholic fury, which was of constantinople, the capital of the christian-controlled byzantine empire."

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