What question did this study set out to answer?

The study aims to explore the perception of Mandarin tones, challenging the idea that tone perception is purely categorical.

May 14, 2026

Visual analog scaling reveals gradient aspects of tone perception beyond 2AFC measures

Key Points

The study aims to explore the perception of Mandarin tones, challenging the idea that tone perception is purely categorical.
Compared two-alternative forced choice (2AFC) and visual analog scale (VAS) tasks using a Tone 1–Tone 2 continuum.
Fifty-three native Mandarin speakers completed both tasks with 11-step synthetic stimuli.
VAS responses showed significantly shallower slopes and greater variability compared to 2AFC (both p < 0.001).
Weak correlation for slope between tasks (ρ = 0.03, p = 0.74), moderate for variability (ρ = 0.37, p < 0.001).
High-Dip participants exhibited sharper category awareness but greater variability, with strong prediction of VAS slope by dip metric (ρ = 0.92, p < 0.001).

Abstract

Mandarin tone perception has traditionally been considered categorical based on binary tasks such as two-alternative forced choice (2AFC). However, recent research suggest that listeners do not exclusively rely on discrete categories; instead, perceptual representations may also involve Gradient Perception (GP), especially in segmental contrast studies using Visual Analog Scale (VAS) task. This study compares 2AFC and VAS to assess perceptual gradiency in a Tone 1–Tone 2 continuum. Fifty-three native Mandarin speakers completed both tasks using 11-step synthetic stimuli. Results revealed significantly shallower slopes and greater response variability (both p 0.001) in VAS responses compared to 2AFC. Correlations between tasks were weak for slope (ρ = 0.03, p = 0.74) but moderate for variability (ρ = 0.37, p 0.001). Dip metric, an indicator unique to VAS reflecting bimodality in VAS responses, strongly predicted VAS slope (ρ = 0.92, p 0.001). High-Dip participants showed sharper category awareness (steeper slopes) but more fluctuation (greater variability). These findings demonstrate that VAS can uncover fine-grained tonal sensitivity masked by binary tasks, and that individual perceptual styles shift by task format. This study supports the coexistence of CP and GP in suprasegmental perception and highlights the value of continuous-response paradigms in speech research.

Mark Helpful

Bookmark

Relay