Auditory cortex activation associated with octave illusion

Terrado, José; Monnier, D.; Perrelet, Daniel; Sagot, Yves; Mattenberger, Louki; King, Béatrice; Kato, Ann C.

doi:10.1097/00001756-200005150-00022

Cited by 30 publications

(29 citation statements)

References 3 publications

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“…As the site of the main auditory cortex, the temporal lobe is responsible for processing dichotic signals [24,25], and for processing the octave illusion [27]. Our results also demonstrated that this area was synchronized with the frontal region when processing the octave illusion, which was concurrent with other EEG findings, so that the frontal (especially the mediofrontal) area is activated when processing auditory stimuli [45,54].…”

Section: Discussionsupporting

confidence: 81%

“…There was also no statistically significant group-difference of the task-related coherence differences of intra-temporal (F [1,27] …”

Section: Reporting Left (N = 11) Reporting Right (N = 18)mentioning

confidence: 86%

“…Some EEG [26] and magnetoencephalography (MEG) [27,28] studies have also illustrated the cerebral activity in response to the octave illusion. [29].…”

Section: Introductionmentioning

confidence: 99%

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Theta power and coherence illustrate cerebral processing of octave illusion

Zheng

Chai

et al. 2014

Translational Neuroscience

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Background: Understanding how cerebral regions are synchronized when hearing illusions might help to explain some of the mechanisms of hallucination in psychiatric disorders. EEG theta coherence in response to the octave illusion in healthy volunteers might be used for this purpose. Methods: Right-handed healthy volunteers were invited to hear silence, normal and reversed sequences of the octave illusion. Results: After hearing both normal and reversed sequences of the octave illusion, 11 people reported hearing the high tone in the left ear (RL) and 18 in the right (RR). The task-related power change in the right frontal and temporal areas and the task-related coherence difference in the right medial frontal and temporal areas were significantly increased in the RR group compared to the RL group. Conclusion: When processing the octave illusion, the right ear predominance was linked to a higher reactivity in the right frontal and right temporal areas in healthy right-handers.

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Section: Discussionsupporting

confidence: 81%

“…There was also no statistically significant group-difference of the task-related coherence differences of intra-temporal (F [1,27] …”

Section: Reporting Left (N = 11) Reporting Right (N = 18)mentioning

confidence: 86%

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Theta power and coherence illustrate cerebral processing of octave illusion

Zheng

Chai

et al. 2014

Translational Neuroscience

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“…Lamminmaki and Hari (2000) conducted a study using magnetoencephalography (MEG) and suggested that the location of the N100m component of the auditory evoked field corresponds to the perceived locations of the tones elicited by the illusory stimulus rather than their actual locations. However, there is debate in the literature about both the generators and the functional significance of the N100m component(s).…”

mentioning

confidence: 99%

Perceived intensity effects in the octave illusion

Sonnadara

Trainor

2005

Perception & Psychophysics

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Complex sounds contain energy at a number of different frequencies. In a typical environment, several objects emit complex sounds overlapping in time. The inner ear performs a frequency analysis over time on the sum of these incoming sound waves, leaving it to higher stages of processing to appropriately recombine the various components into an accurate representation of the original environment. In order to do this, the auditory system must determine what the auditory objects are and where they are located in space.One of the first researchers to study the interaction between the auditory what and where pathways was Deutsch (1974), who demonstrated an interesting phenomenon that she termed the "octave illusion." When participants were presented with an alternating sequence of high (800-Hz) and low (400-Hz) pure tones (such that tones were presented to both ears simultaneously but out of phase, so the left ear was receiving the low tone while the right ear was receiving the high tone, and vice versa), most reported hearing a high tone in the right ear followed by a low tone in the left (see Figures 1A and 1B). When the headphones were reversed so that the left headphone now presented tones to the right ear and the right headphone presented tones to the left, most listeners reported the same percept: The high tone was still heard in the right ear. Most right-handed participants heard the illusion in this manner, but left-handed participants were just as likely to localize the high tone in the left ear as in the right. Deutsch (1983) suggested that this difference might be due to hemispheric dominance, with the high tones perceived as coming from the dominant ear.The octave illusion presents a paradox. Although each ear receives a sequence of high and low tones (see Figures 1A and 1B), Deutsch found that the most commonly reported percept was an alternating pattern with the high tones heard as though they were being presented solely to one ear and the low tones as though they were being presented solely to the other. Interestingly, the low tone is perceived as coming from the ear that is actually being presented with the high tone at that time. In the interpretations of the octave illusion offered by Deutsch and colleagues (e.g., Deutsch, 1975Deutsch, , 1983Deutsch & Roll, 1976), the location (where) information is determined solely by the higher pitched tone, and information from the lower tone is discarded. The pitch (what) information is determined solely by the input to the dominant ear, and information from the nondominant ear appears to be discarded (but see Chambers, Mattingley, & Moss, 2002, 2004, for an alternative, fusion-based model). However, research to date on the octave illusion has been based primarily on verbal reports or methods that do not attempt to quantify the percept across all acoustic dimensions, so it remains unclear whether information from one ear is completely suppressed or whether it makes some contribution to the perceived pitch, timbre, location, and/or intensity of what is heard. W...

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“…Lamminmaki and Hari (2000) focused on the where component. Using MEG, they recorded responses to 400-Hz and 800-Hz tones that were presented in different combinations at the two ears.…”

Section: B the Octave Illusionmentioning

confidence: 99%