Far-field recorded frequency-following responses: Evidence for the locus of brainstem sources

Smith, James C.; Marsh, James T.; Brown, Warren S.

doi:10.1016/0013-4694(75)90047-4

Cited by 248 publications

(173 citation statements)

References 13 publications

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“…At the same time the volume of the binaural beat is conducted to the cortex where it can be objectively measured as frequency-following response because its period, measured in cycles per second, corresponds to the fundamental frequency of the stimulus. This provides proof that the sensation of binaural beating has neurological validity [14].…”

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confidence: 64%

“…The mean (SD) durations of the operation were 48 (28), 53 (42) and 63 (41) min for the blank, classical and Hemi-Sync groups, respectively. Similarly, the mean (SD) intra-operative heart rates were 76 (14), 75 (14) and 75 (9) beat.min ¹1 . The mean (SD) intraoperative maximum systolic blood pressures were 121 (12), 132 (24) and 129 (18) mmHg for blank, classical and Hemi-Sync groups, respectively (p ¼ 0.090) and the mean (SD) intra-operative maximum diastolic blood pressures were 66 (17), 68 (14), and 66 (13) mmHg, respectively.…”

Section: Resultsmentioning

confidence: 93%

“…Similarly, the mean (SD) intra-operative heart rates were 76 (14), 75 (14) and 75 (9) beat.min ¹1 . The mean (SD) intraoperative maximum systolic blood pressures were 121 (12), 132 (24) and 129 (18) mmHg for blank, classical and Hemi-Sync groups, respectively (p ¼ 0.090) and the mean (SD) intra-operative maximum diastolic blood pressures were 66 (17), 68 (14), and 66 (13) mmHg, respectively. The mean (SD) end-tidal isoflurane concentrations in the three groups were 1.0% (0.2) for blank tape, 1.0% (0.2) for the classical tape and 1.0% (0.2) for the Hemi-Sync tape.…”

Section: Resultsmentioning

confidence: 93%

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Hemispheric‐synchronisation during anaesthesia: a double‐blind randomised trial using audiotapes for intra‐operative nociception control

Kliempt¹,

Ruta

Ogston

et al. 1999

Anaesthesia

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SummaryThe possible antinociceptive effect of hemispheric-synchronised sounds, classical music and blank tape were investigated in patients undergoing surgery under general anaesthesia. The study was performed on 76 patients, ASA 1 or 2, aged 18-75 years using a double-blind randomised design. Each of the three tapes was allocated to the patients according to a computer-generated random number table. General anaesthesia was standardised and consisted of propofol, nitrous oxide 66%/ oxygen 33%, isoflurane and fentanyl. Patients breathed spontaneously through a laryngeal mask and the end-tidal isoflurane concentration was maintained near to its minimum alveolar concentration value of 1.2%. Fentanyl was given intravenously sufficient to keep the intra-operative heart rate and arterial blood pressure within 20% of pre-operative baseline values and the fentanyl requirements were used as a measure of nociception control. Patients to whom hemispheric-synchronised sounds were played under general anaesthesia required significantly less fentanyl compared with patients listening to classical music or blank tape (mean values: 28 g, 124 g and 126 g, respectively) (p < 0.001). This difference remained significant when regression analysis was used to control for the effects of age and sex.

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mentioning

confidence: 64%

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 93%

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Hemispheric‐synchronisation during anaesthesia: a double‐blind randomised trial using audiotapes for intra‐operative nociception control

Kliempt¹,

Ruta

Ogston

et al. 1999

Anaesthesia

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“…While other peaks are discernable in this region, a previous study (King et al, 2002) determined that peaks C and F were the most stable for this stimulus across individuals, having latencies with standard deviations (SDs) less than 0.5 ms across a normal population. The defining feature of the sustained portion of the response is its periodicity, which follows the frequency information contained in the stimulus (Marsh et al, 1974;Smith et al, 1975). The timing and magnitude of both the transient and sustained aspects of the response waveform were evaluated with the measures described below and summarized in Table 1.…”

Section: Description Of the Brainstem Response To Speech Syllablesmentioning

confidence: 99%

Brainstem responses to speech syllables

Russo

Nicol

Musacchia

et al. 2004

Clinical Neurophysiology

305

267

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Objective-To establish reliable procedures and normative values to quantify brainstem encoding of speech sounds.Methods-Auditory brainstem responses to speech syllables presented in quiet and in background noise were obtained from 38 normal children. Brainstem responses consist of transient and sustained, periodic components-much like the speech signal itself. Transient peak responses were analyzed with measures of latency, amplitude, area, and slope. Magnitude of sustained, periodic frequencyfollowing responses was assessed with root mean square, fundamental frequency, and first formant amplitudes; timing was assessed by stimulus-to-response and quiet-to-noise inter-response correlations.Results-Measures of transient and sustained components of the brainstem response to speech syllables were reliably obtained with high test-retest stability and low variability across subjects. All components of the brainstem response were robust in quiet. Background noise disrupted the transient responses whereas the sustained response was more resistant to the deleterious effects of noise.Conclusions-The speech-evoked brainstem response faithfully reflects many acoustic properties of the speech signal. Procedures to quantitatively describe it have been developed.Significance-Accurate and precise manifestation of stimulus timing at the auditory brainstem is a hallmark of the normal perceptual system. The brainstem response to speech sounds provides a mechanism for understanding the neural bases of normal and deficient attention-independent auditory function.

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“…This has been demonstrated using scalp recordings of the frequency following response (FFR), an evoked potential which reflects neural phase locking of brainstem nuclei (inferior colliculus and lateral lemniscus, Smith et al 1975;Gardi et al 1979) to the envelope of a sound. The enhancement of the FFR in musicians and speakers of a tone language has been explained as a result of subcortical plasticity driven by the extensive practice these populations of listeners have in identifying and discriminating sounds on the basis of pitch.…”

Section: Introductionmentioning

confidence: 99%

Subcortical Plasticity Following Perceptual Learning in a Pitch Discrimination Task

Carcagno

Plack

2010

JARO

133

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Practice can lead to dramatic improvements in the discrimination of auditory stimuli. In this study, we investigated changes of the frequency-following response (FFR), a subcortical component of the auditory evoked potentials, after a period of pitch discrimination training. Twenty-seven adult listeners were trained for 10 h on a pitch discrimination task using one of three different complex tone stimuli. One had a static pitch contour, one had a rising pitch contour, and one had a falling pitch contour. Behavioral measures of pitch discrimination and FFRs for all the stimuli were measured before and after the training phase for these participants, as well as for an untrained control group (n=12). Trained participants showed significant improvements in pitch discrimination compared to the control group for all three trained stimuli. These improvements were partly specific for stimuli with the same pitch modulation (dynamic vs. static) and with the same pitch trajectory (rising vs. falling) as the trained stimulus. Also, the robustness of FFR neural phase locking to the sound envelope increased significantly more in trained participants compared to the control group for the static and rising contour, but not for the falling contour. Changes in FFR strength were partly specific for stimuli with the same pitch modulation (dynamic vs. static) of the trained stimulus. Changes in FFR strength, however, were not specific for stimuli with the same pitch trajectory (rising vs. falling) as the trained stimulus. These findings indicate that even relatively low-level processes in the mature auditory system are subject to experience-related change.

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Far-field recorded frequency-following responses: Evidence for the locus of brainstem sources

Cited by 248 publications

References 13 publications

Hemispheric‐synchronisation during anaesthesia: a double‐blind randomised trial using audiotapes for intra‐operative nociception control

Hemispheric‐synchronisation during anaesthesia: a double‐blind randomised trial using audiotapes for intra‐operative nociception control

Brainstem responses to speech syllables

Subcortical Plasticity Following Perceptual Learning in a Pitch Discrimination Task

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