Fig. 2
From: Paradigmatic enhancement of stem vowels in regular English inflected verb forms
Position of the tongue tip (left) and tongue body (right) sensor at the onset of the vowel, for [i] (triangles) and [ɑ] (disks) by morphological condition (ø: stem, s: third person singular, d: past tense, ing: gerund). Axis are in millimeters. The relative position between [i] and [ɑ] has been reduced to increase the discriminability of the tense effects. The opening of the oral cavity is to the left. Random effects were excluded for prediction