The absolute threshold refers to:
◦ the smallest amount of a stimulus necessary for a person to detect it 100 percent of the time.
◦ an established threshold for which all people can detect a particular stimulus 100 percent of the time.
◦ an established threshold for which all people can detect a particular stimulus at least 50 percent of the time.
◦ the smallest amount of a stimulus necessary for a person to detect it at least 50 percent of the time.