Preamble I believe is it looking for a document? If so this should be it :D
Answer:
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Without a source of systematically controlled synthetic stimuli experiments on the acoustic cues for speech, perception would be impossible.
<h3>What is perception?</h3>
A perception is referred to as an opinion or mindset an individual creates about something based on the experiences of his feelings and understanding of the environment. This perception can be both negative and positive.
A Stimuli help to generate a reaction or response to any concept or issue discussed in a systematic manner to meet any decisions. So without systematically controlled stimuli experiments for speech perception would be considered impossible.
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European leaders like Spain's King Ferdinand and the Portuguese prince known as Henry the Navigator financed explorers who wanted to travel across the seas. Along with the idea of looking for new trade routes, they also hoped to find new sources of gold, silver, and other valuables.