Because identification of vowels was not affected by reverberation, possible changes in perception were assessed in a paired comparison paradigm. Fifteen English vowels and diphthongs recorded with and without reverberation (T= 1.2 s) were paired with each other. Ten normal‐hearing subjects made similarity judgments using a scale from 1 to 7. Response matrices for the two conditions were analyzed using multidimensional scaling procedures. A three‐dimensional solution was sought for the data on the basis of the experimental conditions and results of previous studies. Three‐ and two‐way analyses were performed using a ALSCAL subroutine. Both with and without reverberation, the first two dimensions were identified as back‐front and low‐high, confirming the results of previous studies. The third dimension was identified as long‐short while others interpreted it as tensness, openness, or left it unidentified. In both three‐ and two‐way analyses, the shifts in stimulus configuration between test and retest and between reverberant and nonreverberant solutions were of the same order. Therefore, we concluded that reverberation did not contribute significantly to the perceptual distances among vowels and diphtongs. [Supported by NIH.]