Octave Illusion Reference
Return the two-channel pattern and localization cautions of Deutsch’s octave illusion.
Description
Deutsch’s octave illusion uses opposing pitch sequences in the two ears.
Deutsch’s octave illusion uses opposing pitch sequences in the two ears. Perceived pitch and location can differ across listeners and setups.1
Return the two-channel pattern and localization cautions of Deutsch’s octave illusion.
When to use Octave Illusion Reference
Use this tool to return the two-channel pattern and localization cautions of Deutsch’s octave illusion.
Choose a supported reference topic, run an input-free reference with an empty object, or prepare the measured values and caller-supplied test records requested. Keep acoustic metrics, frequency, units and test conditions consistent.
How to use Octave Illusion Reference and understand its results
- Choose a supported reference topic, run an input-free reference with an empty object, or prepare the measured values and caller-supplied test records requested. Keep acoustic metrics, frequency, units and test conditions consistent.
- Enter topic using the field table and calculation rules, then run the tool.
- Read source, statement, topic. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| topic | Reference topic to return. | string; one of "stimulus", "percept", "caution" | Required |
Choose an exact topic enum from the input table and run the lookup. The implementation selects a fixed local entry and returns source, statement and the selected topic. Matching is case-sensitive without trimming or free-text search.
result=stored entry for selected topic Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| source | Source used for the reference statement. | string |
| statement | Narrow reference statement for the selected topic. | string |
| topic | Selected reference topic. | string; one of "stimulus", "percept", "caution" |
{
"input": {
"topic": "stimulus"
},
"output": {
"source": "Diana Deutsch, 1974",
"statement": "Deutsch’s octave illusion alternates high and low tones between the ears so each ear receives the opposite sequence.",
"topic": "stimulus"
}
}Limitations and assumptions
No audio, channel test or listener assessment is performed. The source is a stored bibliographic label, not a fetched document; statements are not refreshed at runtime.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Speech-to-Song Reference: Return the repetition-based speech-to-song illusion and its limitations. For a complementary task, use Shepard Tone Reference: Return the construction and perceptual limitation of the Shepard-tone pitch-class illusion.
References
-
Octave Illusion Reference — tool.io
Similar or alternative tools
- Speech-to-Song Reference
Return the repetition-based speech-to-song illusion and its limitations.
- Shepard Tone Reference
Return the construction and perceptual limitation of the Shepard-tone pitch-class illusion.