The method of adjustment is flexible but yields listener-dependent thresholds

Evidence

In contrast to the method of constant stimuli, which can be time consuming and requires a priori knowledge of the stimulus levels to be selected, the other two classical methods, the method of adjustment and the method of limits, offer more flexibility and efficiency. The method of adjustment is unique in that it allows the listener to adjust the stimulus and find the threshold. While this method is appealing and can yield a threshold in a matter of seconds, it has no fixed response percentage associated with threshold, and thresholds depend greatly on how individual listeners define their threshold. Because of the weaknesses associated with the method of adjustment, it is not commonly used to estimate threshold. However, various experiments assessing subjective percepts (like loudness or pitch) still adopt this method, and its implementation has greatly influenced our understanding of these perceptions. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 294

Categorization

Category: Definitional Content

• DEFINE: Contrasts the method of adjustment with constant stimuli and limits, explains its trade-offs.

Related

• Self-adjustment threshold methods are fast but lack a standardized response criterion across listeners. (similarity 0.96)
• The method of limits estimates thresholds by averaging ascending and descending detection levels (similarity 0.88)
• Thresholds can be measured by tracing stimulus change until perception flips (similarity 0.84)
• Constant-stims method maps full psychophysical functions rather than single thresholds (similarity 0.84)
• Thresholds are measured by presenting many stimulus levels and fitting a psychometric function (similarity 0.83)
• Accuracy and function-shape information trade off against speed in threshold measurement (similarity 0.82)
• Threshold estimates reflect both ear sensitivity and listener response bias (similarity 0.82)
• Tracking methods differ from adjustment by letting subjects control only direction, not magnitude (similarity 0.82)
• Constant stimuli remains gold standard but is too slow for routine use (similarity 0.82)
• Method-of-limits thresholds are distorted by subjects’ response tendencies (similarity 0.82)
• The method of constant stimuli needs prior knowledge of testable levels (similarity 0.81)
• Constant-stimuli threshold measurement is time consuming because many trials are needed per level. (similarity 0.81)
• Sensation level and per-band audiogram equalization are distinct ways to control audibility (similarity 0.81)
• The method of limits is inherently prone to response bias (similarity 0.81)
• Speech reception thresholds are measured adaptively with listener self-scoring. (similarity 0.81)