a large group of students were tested for their ability to distinguish among different tones. although tone a and tone b were slightly different, more than half the time the group rated the tones as being the same. the difference between tone a and tone b can be said to be less than: question 8 options: 1) weber's threshold. 2) the absolute threshold, or average absolute threshold. 3) the subliminal threshold. 4) the difference threshold, or just noticeable difference.