Figure 2.

Shown are group means and standard deviations for a task in which subjects reported the order of six vowels appearing in sequence. Thus, low scores represent a tendency toward segregation. Alternate vowels were at alternate F₀ values (F₀₍₁₎ and F₀₍₂₎). In the LowRef conditions (upper panels), F₀₍₁₎ was fixed at 100 Hz and in the HiRef conditions (lower panels) F₀₍₁₎ was fixed at 240 Hz. Conditions Q₂₀ and Q₁₂ involved reduced frequency resolution via 20- and 12-channel noise vocoders. Filled squares represent a Fast condition (6.0 vowel∕s) in which streaming can occur, and open circles represent a Slow condition (1.2 vowel∕s) that ensures accurate item identification. The abscissa is logarithmic.