Auditory and visual event-related perturbations in the 40 Hz auditory steady-state response

Rohrbaugh, John; Varner, Jerald L.; Paige, Stephen R.; Eckardt, Michael J.; Ellingson, Robert J.

doi:10.1016/0013-4694(90)90213-4

Cited by 17 publications

(13 citation statements)

References 33 publications

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“…The training effect on ASSR phase (a latency increase with respect to sound onset) was fully expressed over the initial 488 ms of the stimulus which was free of target events and persisted without diminution until stimulus offset. The latter result suggests that changes in ASSR phase resulting from auditory experience were not affected by resets of the ASSR that can be evoked when salient stimuli (for example, an unexpected change in carrier frequency or a noise burst) are delivered during auditory tasks (Rohrbaugh et al, 1990a; Ross et al, 2005; Bosnyak et al, 2007). We have not observed reset responses to target stimuli in our studies, likely because the target stimuli were close to the TH of detection and did not alter the AM rhythm or its carrier frequency.…”

Section: Discussionmentioning

confidence: 94%

Neural plasticity expressed in central auditory structures with and without tinnitus

Roberts¹,

Bosnyak²,

Thompson³

2012

Front. Syst. Neurosci.

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Sensory training therapies for tinnitus are based on the assumption that, notwithstanding neural changes related to tinnitus, auditory training can alter the response properties of neurons in auditory pathways. To assess this assumption, we investigated whether brain changes induced by sensory training in tinnitus sufferers and measured by electroencephalography (EEG) are similar to those induced in age and hearing loss matched individuals without tinnitus trained on the same auditory task. Auditory training was given using a 5 kHz 40-Hz amplitude-modulated (AM) sound that was in the tinnitus frequency region of the tinnitus subjects and enabled extraction of the 40-Hz auditory steady-state response (ASSR) and P2 transient response known to localize to primary and non-primary auditory cortex, respectively. P2 amplitude increased over training sessions equally in participants with tinnitus and in control subjects, suggesting normal remodeling of non-primary auditory regions in tinnitus. However, training-induced changes in the ASSR differed between the tinnitus and control groups. In controls the phase delay between the 40-Hz response and stimulus waveforms reduced by about 10° over training, in agreement with previous results obtained in young normal hearing individuals. However, ASSR phase did not change significantly with training in the tinnitus group, although some participants showed phase shifts resembling controls. On the other hand, ASSR amplitude increased with training in the tinnitus group, whereas in controls this response (which is difficult to remodel in young normal hearing subjects) did not change with training. These results suggest that neural changes related to tinnitus altered how neural plasticity was expressed in the region of primary but not non-primary auditory cortex. Auditory training did not reduce tinnitus loudness although a small effect on the tinnitus spectrum was detected.

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Section: Discussionmentioning

confidence: 94%

Neural plasticity expressed in central auditory structures with and without tinnitus

Roberts¹,

Bosnyak²,

Thompson³

2012

Front. Syst. Neurosci.

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“…harmonically or spatially), it must disrupt or abolish 35 PROCESS TIMING AND TONAL HARMONY the previous cycle in order to assert its presence (e.g. Rohrbaugh, Varner, Paige, Eckardt and Ellingson, 1990;Snyder & Large, 2002).…”

Section: Discussionmentioning

confidence: 99%

Process timing and its relation to the coding of tonal harmony.

Aksentijevic¹,

Barber²,

Elliott³

2011

Journal of Experimental Psychology: Human Perception and Perfor

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Advances in auditory research suggest that gamma-band synchronization of frequency-specific cortical loci could be responsible for the integration of pure tones (harmonics) into harmonic complex tones. Thus far, evidence for such a mechanism has been revealed in neurophysiological studies, with little corroborative psychophysical evidence. In six experiments, we observed a rate-and time-specific response-time advantage for a sequence of target pips when the defining frequency of the target was a fractional multiple of a priming frequency. The effect was only observed when the prime and target sequences were presented at 33 pips per second and when the interstimulus interval was approximately 100 and 250 ms. This evidence implicates oscillatory gamma-band activity in the representation of harmonic complex tones and suggests that synchronization with precise temporal characteristics is important for disambiguating related harmonic templates. An outline of a model is presented, which accounts for these findings in terms of fast resynchronization of relevant neuronal assemblies.

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“…The significance of the CERP is that they indicate that the SSR is a dynamic wave which is probably cortically influenced. (Galambos and Makieg, 1988;Rohrbaugh et al, 1990). This wave has a high signal-to-noise ratio compared with the MLR and so may be a more useful tool.…”

Section: Conscious Awareness Is Not Necessary For Information Processmentioning

confidence: 99%

Altered consciousness: pharmacology and phenomenology BAP Summer Meeting, York, July 1991

Munglani

Jones

1992

J Psychopharmacol

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In this article parallels are drawn between sleep and anaesthesia. Both can be described as 'behavioural states' in which stimulation and inhibition of certain neuronal groups will give rise to specific psychological states. The neuronal mechanisms leading to these states are reviewed and compared. Sensory information flow through the thalamus is reduced in sleep and anaesthesia, the thalamic gating being controlled by other areas of the brain including the sensory cortex. Thus a feedback loop may exist with the brain determining its own level of arousal. Anaesthesia increases gating at the thalamus and thus specifically reduces arousal. Consciousness is a specific attribute of the brain and is not required for the processing of sensory stimuli and learning, both of which have been shown to occur during sleep and anaesthesia. The implications of these findings for monitoring awareness during anaesthesia are discussed.

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Auditory and visual event-related perturbations in the 40 Hz auditory steady-state response

Cited by 17 publications

References 33 publications

Neural plasticity expressed in central auditory structures with and without tinnitus

Neural plasticity expressed in central auditory structures with and without tinnitus

Process timing and its relation to the coding of tonal harmony.

Altered consciousness: pharmacology and phenomenology BAP Summer Meeting, York, July 1991

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