EurekaMag.com logo
+ Translate

Different analysis of frequency and amplitude modulations of a continuous tone in the human auditory cortex a neuromagnetic study


, : Different analysis of frequency and amplitude modulations of a continuous tone in the human auditory cortex a neuromagnetic study. Hearing Research 27(3): 257-264

We have measured auditory evoked magnetic fields to intermittent frequency and amplitude modulations of (FMs and AMs) of a continuous tone in 6 healthy humans. The stimuli were presented in pairs separated by 500 ms in four different combinations (FM-AM, FM-FM, AM-FM and AM-AM). Both modulations elicited neuromagnetic responses of similar waveforms: the largest deflection, N100m (magnetic counterpart of the electric N100), was preceded by a low amplitude P60m and followed by P200m. For stimuli of different types, the decrease of N100m from the first to the second reponse was less than expected from the recovery cycle of the responses, estimated from the pairs of similar stimuli. We interpret these results as evidence for different processing of amplitude and frequency modulations in the auditory pathways up to the level of supratemporal auditory cortex.

Accession: 005151863

PMID: 3610854

DOI: 10.1016/0378-5955(87)90007-4

Download PDF Full Text: Different analysis of frequency and amplitude modulations of a continuous tone in the human auditory cortex a neuromagnetic study


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Pardo, P.J.; Makela, J.P.; Sams, M.; Hari, R., 1994: Neuromagnetic measurements of hemispheric differences in auditory processing of frequency and amplitude modulations. Society for Neuroscience Abstracts 20(1-2): 325

Malone, B.J.; Scott, B.H.; Semple, M.N., 2000: Processing of sinusoidal modulations of amplitude and frequency in the auditory cortex of alert rhesus macaques. Amplitude and frequency modulation are important features of natural sounds and communication signals. We examined the responses of single auditory cortical neurons to sinusoidally amplitude (SAM) and frequency (SFM) modulated tones presented dich...

Liang, L.; Lu, T.; Wang, X., 2002: Neural representations of sinusoidal amplitude and frequency modulations in the primary auditory cortex of awake primates. We investigated neural coding of sinusoidally modulated tones (sAM and sFM) in the primary auditory cortex (A1) of awake marmoset monkeys, demonstrating that there are systematic cortical representations of embedded temporal features that are base...

Riecke, L.; Scharke, W.; Valente, G.; Gutschalk, A., 2015: Sustained selective attention to competing amplitude-modulations in human auditory cortex. Auditory selective attention plays an essential role for identifying sounds of interest in a scene, but the neural underpinnings are still incompletely understood. Recent findings demonstrate that neural activity that is time-locked to a particula...

Brechmann, Aé.; Baumgart, F.; Scheich, H., 2002: Sound-level-dependent representation of frequency modulations in human auditory cortex: a low-noise fMRI study. Recognition of sound patterns must be largely independent of level and of masking or jamming background sounds. Auditory patterns of relevance in numerous environmental sounds, species-specific vocalizations and speech are frequency modulations (F...

Sams M.; Naatanen R., 1991: Neuromagnetic responses of the human auditory cortex to short frequency glides. Neuromagnetic responses were recorded to 33-ms frequency-glide tones with a 7-channel SQUID gradiometer. NInety per cent of the tones were of rising/falling frequency and 10% otherwise similar tones but presented backwards, i.e. comparable falling...

Pardo, P.J.; Mäkelä, J.P.; Sams, M., 1999: Hemispheric differences in processing tone frequency and amplitude modulations. TRANSIENT frequency and amplitude modulations (FMs, AMs) of sound are requisite to speech recognition. We recorded whole-head magnetoencephalographic signals from seven subjects to binaural 620 ms 667 Hz tones, with 3, 30, or 300 ms FMs or AMs in...

Mäkelä, J.P., 1988: Contra- and ipsilateral auditory stimuli produce different activation patterns at the human auditory cortex. A neuromagnetic study. Auditory evoked magnetic fields were recorded over the right hemisphere of healthy humans. The stimuli were noise bursts presented either to the contra- (C) or ipsilateral (I) ear in different combinations. The largest deflection of the responses,...

Makela J.P., 1988: Contralateral and ipsilateral auditory stimuli produce different activation patterns at the human auditory cortex a neuromagnetic study. Auditory evoked magnetic fields were recorded over the right hemisphere of healthy humans. The stimuli were noise bursts presented either to the contra- (C) or ipsilateral (I) ear in different combinations. The largest deflection of the responses,...

Altmann, C.F.; Klein, C.; Heinemann, L.V.; Wibral, M.; Gaese, B.H.; Kaiser, J., 2012: Repetition of complex frequency-modulated sweeps enhances neuromagnetic responses in the human auditory cortex. Frequency modulations (FM) play a decisive role in our everyday communication. To investigate the processing of FM direction we measured change-related auditory cortex responses with human magnetoencephalography. First, we tested for FM direction...