Loudness Enhancement Following Contralateral Stimulation

1972 ◽  
Vol 52 (4B) ◽  
pp. 1127-1130 ◽  
Author(s):  
R. Galambos ◽  
J. Bauer ◽  
T. Picton ◽  
K. Squires ◽  
N. Squires
Keyword(s):  
Contralateral Stimulation ◽  
Loudness Enhancement

Loudness Enhancement Following Contralateral Stimulation

1972 ◽  
Vol 51 (1A) ◽  
pp. 141-141 ◽  
Author(s):  
R. Galambos ◽  
J. Bauer ◽  
T. Picton ◽  
K. Squires ◽  
N. Squires
Keyword(s):  
Contralateral Stimulation ◽  
Loudness Enhancement

Suppression of DPOAE with Various Noise Bands under Contralateral Stimulation in Normal Hearing Adults

2006 ◽  
Vol 2 (2) ◽  
pp. 147-154
Author(s):  
Hyun-Kyung Jang ◽  
Sungmin Koo ◽  
Sungeun Kim ◽  
Dukhwan Lim
Keyword(s):  
Normal Hearing ◽  
Contralateral Stimulation

An Attempt to Demonstrate Contralateral Masking in Pressure Adaptation

1972 ◽  
Vol 35 (3) ◽  
pp. 856-858 ◽  
Author(s):  
Stanley Finger ◽  
Harvey S. Levin
Keyword(s):  
Test Stimulus ◽  
Somatosensory System ◽  
Adaptation Time ◽  
Contralateral Stimulation ◽  
Pressure Adaptation ◽  
Masking Stimulus ◽  
Contralateral Masking ◽  
Stimulation Of

Adaptation to punctate pressure Stimulation of the ring finget (test stimulus) was studied under conditions of more intense contralateral stimulation of homologous or non-homologous loci (masking stimuli). Contrary to expectation, the temporally contiguous masking stimulus did not affect adaptation time to the test stimulus. This finding was discussed in terms of other tactile masking studies and electrophysiological investigations of the somatosensory system.

scholarly journals Different Patterns of Attention Modulation in Early N140 and Late P300 sERPs Following Ipsilateral vs. Contralateral Stimulation at the Fingers and Cheeks

2021 ◽  
Vol 15 ◽  
Author(s):  
Laura Lindenbaum ◽  
Sebastian Zehe ◽  
Jan Anlauff ◽  
Thomas Hermann ◽  
Johanna Maria Kissler
Keyword(s):  
Body Part ◽  
Oddball Paradigm ◽  
Body Parts ◽  
Somatosensory Processing ◽  
Hemispheric Processing ◽  
Contralateral Stimulation ◽  
Early Processing ◽  
Similarities And Differences ◽  
Ipsilateral Stimulation ◽  
Stimulation Of

Intra-hemispheric interference has been often observed when body parts with neighboring representations within the same hemisphere are stimulated. However, patterns of interference in early and late somatosensory processing stages due to the stimulation of different body parts have not been explored. Here, we explore functional similarities and differences between attention modulation of the somatosensory N140 and P300 elicited at the fingers vs. cheeks. In an active oddball paradigm, 22 participants received vibrotactile intensity deviant stimulation either ipsilateral (within-hemisphere) or contralateral (between-hemisphere) at the fingers or cheeks. The ipsilateral deviant always covered a larger area of skin than the contralateral deviant. Overall, both N140 and P300 amplitudes were higher following stimulation at the cheek and N140 topographies differed between fingers and cheek stimulation. For the N140, results showed higher deviant ERP amplitudes following contralateral than ipsilateral stimulation, regardless of the stimulated body part. N140 peak latency differed between stimulated body parts with shorter latencies for the stimulation at the fingers. Regarding P300 amplitudes, contralateral deviant stimulation at the fingers replicated the N140 pattern, showing higher responses and shorter latencies than ipsilateral stimulation at the fingers. For the stimulation at the cheeks, ipsilateral deviants elicited higher P300 amplitudes and longer latencies than contralateral ones. These findings indicate that at the fingers ipsilateral deviant stimulation leads to intra-hemispheric interference, with significantly smaller ERP amplitudes than in contralateral stimulation, both at early and late processing stages. By contrast, at the cheeks, intra-hemispheric interference is selective for early processing stages. Therefore, the mechanisms of intra-hemispheric processing differ from inter-hemispheric ones and the pattern of intra-hemispheric interference in early and late processing stages is body-part specific.

scholarly journals Investigating Influences of Medial Olivocochlear Efferent System on Central Auditory Processing and Listening in Noise: A Behavioral and Event-Related Potential Study

2020 ◽  
Vol 10 (7) ◽  
pp. 428
Author(s):  
Aparna Rao ◽  
Tess K. Koerner ◽  
Brandon Madsen ◽  
Yang Zhang
Keyword(s):  
Word Recognition ◽  
Otoacoustic Emission ◽  
Event Related Potential ◽  
Behavioral Performance ◽  
Contralateral Stimulation ◽  
Related Potentials ◽  
Noise Test ◽  
Medial Olivocochlear ◽  
Listening In Noise ◽  
Physiological Tests

This electrophysiological study investigated the role of the medial olivocochlear (MOC) efferents in listening in noise. Both ears of eleven normal-hearing adult participants were tested. The physiological tests consisted of transient-evoked otoacoustic emission (TEOAE) inhibition and the measurement of cortical event-related potentials (ERPs). The mismatch negativity (MMN) and P300 responses were obtained in passive and active listening tasks, respectively. Behavioral responses for the word recognition in noise test were also analyzed. Consistent with previous findings, the TEOAE data showed significant inhibition in the presence of contralateral acoustic stimulation. However, performance in the word recognition in noise test was comparable for the two conditions (i.e., without contralateral stimulation and with contralateral stimulation). Peak latencies and peak amplitudes of MMN and P300 did not show changes with contralateral stimulation. Behavioral performance was also maintained in the P300 task. Together, the results show that the peripheral auditory efferent effects captured via otoacoustic emission (OAE) inhibition might not necessarily be reflected in measures of central cortical processing and behavioral performance. As the MOC effects may not play a role in all listening situations in adults, the functional significance of the cochlear effects of the medial olivocochlear efferents and the optimal conditions conducive to corresponding effects in behavioral and cortical responses remain to be elucidated.

High-frequency neurons in the inferior colliculus that are sensitive to interaural delays of amplitude-modulated tones: evidence for dual binaural influences

1993 ◽  
Vol 70 (1) ◽  
pp. 64-80 ◽  
Author(s):  
R. Batra ◽  
S. Kuwada ◽  
T. R. Stanford
Keyword(s):  
Inferior Colliculus ◽  
High Frequency ◽  
Low Frequency ◽  
Sound Field ◽  
Low Frequencies ◽  
Contralateral Stimulation ◽  
Binaural Stimulation ◽  
Pure Tones ◽  
Ipsilateral Stimulation ◽  
Inferior Colliculi

1. Localization of sounds has traditionally been considered to be performed by a duplex mechanism utilizing interaural temporal differences (ITDs) at low frequencies and interaural intensity differences at higher frequencies. More recently, it has been found that listeners can detect ITDs at high frequencies if the amplitude of the sound varies and an ITD is present in the envelope. Here we report the responses of neurons in the inferior colliculi of unanesthetized rabbits to ITDs of the envelopes of sinusoidally amplitude-modulated (SAM) tones. 2. Neurons were studied extracellularly with glass-coated Pt-Ir or Pt-W microelectrodes. Their sensitivity to ITDs in the envelopes of high-frequency sounds (> or = 2 kHz) was assessed using SAM tones that were presented binaurally. The tones at the two ears had the same carrier frequency but modulation frequencies that differed by 1 Hz. This caused a cyclic variation in the ITD produced by the envelope. In this "binaural SAM" stimulus, the carriers caused no ITD because they were in phase. In addition to the binaural SAM stimulus, pure tones were used to investigate responses to ipsilateral and contralateral stimulation and the nature of the interaction during binaural stimulation. 3. Neurons tended to display one of two kinds of sensitivity to ITDs. Some neurons discharged maximally at the same ITD at all modulation frequencies > 250 Hz (peak-type neurons), whereas others were maximally suppressed at the same ITD (trough-type neurons). 4. At these higher modulation frequencies (> 250 Hz), the characteristic delays that neurons exhibited tended to lie within the range that a rabbit might normally encounter (+/- 300 microseconds). The peak-type neurons favored ipsilateral delays, which correspond to sounds in the contralateral sound field. The trough-type neurons showed no such preference. 5. The preference of peak-type neurons for a particular delay was sharper than that of trough-type neurons and was comparable to that observed in neurons of the inferior colliculus that are sensitive to delays of low-frequency pure tones. 6. At lower modulation frequencies (< 150 Hz) characteristic delays often lay beyond +/- 300 microseconds. 7. Increasing the ipsilateral intensity tended to shift the preferred delay ipsilaterally at lower (< 250 Hz), but not at higher, modulation frequencies. 8. When tested with pure tones, a substantial number of peak-type neurons were found to be excited by contralateral stimulation but inhibited by ipsilateral stimulation.(ABSTRACT TRUNCATED AT 400 WORDS)

Spectral and Temporal Parameters of Contralateral Signals Altering Temporary Threshold Shift

1974 ◽  
Vol 17 (1) ◽  
pp. 41-50 ◽  
Author(s):  
Raymond S. Karlovich ◽  
Terry L. Wiley
Keyword(s):  
Dynamic Properties ◽  
Broad Band ◽  
Normal Hearing ◽  
Threshold Shift ◽  
Temporary Threshold Shift ◽  
Acoustic Reflex ◽  
Contralateral Stimulation ◽  
Band Noise ◽  
Resultant Data ◽  
Contralateral Ear

The test ear of each of nine normal-hearing subjects was exposed for three minutes to a 1000-Hz tone at 110 dB SPL. Either a 4000-Hz tone at 105 dB SPL or a broad-band noise at 100 dB SPL was presented to the contralateral ear during exposure. Four different temporal patterns were used for each contralateral signal: (1) continuous, (2) 18 seconds on/18 seconds off, (3) 1.8 seconds on/1.8 seconds off, and (4) 0.18 seconds on/0.18 seconds off. A control condition, consisting of the absence of contralateral stimulation, also was used. Pre- and postexposure thresholds for the test ear were tracked at a signal one-half octave above the exposure frequency. Resultant data indicated that reduction in temporary threshold shift was greatest for conditions involving rapidly pulsed (1.8 and 0.18 seconds on-off) contralateral signals. We hypothesized that these data were reflective of the dynamic properties of the acoustic reflex. Specifically, we posited that the acoustic reflex manifests less adaptation in response to rapid signal-repetition rates and relatively more adaptation to sustained or slowly pulsed signals.

Time course of loudness enhancement and intensity discrimination

1975 ◽  
Vol 58 (S1) ◽  
pp. S35-S35 ◽  
Author(s):  
R. Elmasian ◽  
R. Morgan ◽  
R. Galambos
Keyword(s):  
Time Course ◽  
Intensity Discrimination ◽  
Loudness Enhancement
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