Santiago wants to find out how well his classmates can hear high-pitched noises. In his first round of testing, only 45 percent of participants were able to hear any of the sounds he broadcasts to them. These sounds have failed to reach what?

The absolute threshold is the weakest stimulus a person can detect at least 50 percent of the time. Since only 45 percent of Santiago’s participants could hear the sounds, the sounds fall below that threshold. The correct choice is D, absolute threshold.

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