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Table 1 Overview over the assignment of the phonological feature ROUND as well as the pitch and formant frequency variability in the vowel categories used.

From: Perception of acoustically complex phonological features in vowels is reflected in the induced brain-magnetic activity

Vowel category ROUND F0min-max F1min-max F2min-max F3min-max
[a] - 103–113 552–747 1188–1224 2663–3171
[i] - 127–132 267–287 2048–2120 2838–3028
[e] - 109–125 302–322 2055–2143 2711–2890
[y] + 115–144 238–248 1516–1769 1978–2097
[ø] + 108–125 301–325 1293–1447 1945–2079
[u] + 112–118 231–256 522–645 2117–2292
[o] + 109–125 293–346 471–609 2481–2688
  1. F0 refers to the pitch and F1, F2, F3 to the corresponding formant frequencies.