The responses of single units in the inferior colliculus of the guinea pig to damped and ramped sinusoids

Neuert, Veronika; Pressnitzer, Daniel; Patterson, Roy D.; Winter, Ian M.

doi:10.1016/s0378-5955(01)00318-5

Cited by 26 publications

(19 citation statements)

References 21 publications

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“…Similarly, asymmetries have been reported in both the rate and temporal responses of IC neurons in guinea pig to exponentially ramped and damped sinusoids (197). When such ramped and damped stimuli have the same half-life, their long-term spectra are identical, but their different temporal structures generate quite distinct percepts (205).…”

Section: Contribution Of Nonlinearitiesmentioning

confidence: 54%

Neural Processing of Amplitude-Modulated Sounds

Joris

Schreiner

Rees

2004

Physiological Reviews

853

861

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Amplitude modulation (AM) is a temporal feature of most natural acoustic signals. A long psychophysical tradition has shown that AM is important in a variety of perceptual tasks, over a range of time scales. Technical possibilities in stimulus synthesis have reinvigorated this field and brought the modulation dimension back into focus. We address the question whether specialized neural mechanisms exist to extract AM information, and thus whether consideration of the modulation domain is essential in understanding the neural architecture of the auditory system. The available evidence suggests that this is the case. Peripheral neural structures not only transmit envelope information in the form of neural activity synchronized to the modulation waveform but are often tuned so that they only respond over a limited range of modulation frequencies. Ascending the auditory neuraxis, AM tuning persists but increasingly takes the form of tuning in average firing rate, rather than synchronization, to modulation frequency. There is a decrease in the highest modulation frequencies that influence the neural response, either in average rate or synchronization, as one records at higher and higher levels along the neuraxis. In parallel, there is an increasing tolerance of modulation tuning for other stimulus parameters such as sound pressure level, modulation depth, and type of carrier. At several anatomical levels, consideration of modulation response properties assists the prediction of neural responses to complex natural stimuli. Finally, some evidence exists for a topographic ordering of neurons according to modulation tuning. The picture that emerges is that temporal modulations are a critical stimulus attribute that assists us in the detection, discrimination, identification, parsing, and localization of acoustic sources and that this wide-ranging role is reflected in dedicated physiological properties at different anatomical levels.

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Section: Contribution Of Nonlinearitiesmentioning

confidence: 54%

Neural Processing of Amplitude-Modulated Sounds

Joris

Schreiner

Rees

2004

Physiological Reviews

853

861

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“…This concerns the domains of physiology (e.g., Neuert, Pressnitzer, Patterson, & Winter, 2001), psychophysics (e.g., Meunier et al, 2014;Schlauch, Ries, & DiGiovanni, 2001;Stecker & Hafter, 2000) as well as neurosciences (Wang, Qin, Chimoto, Tazunoki, & Sato, 2014). Temporally asymmetric stimuli were used to model the amplitude envelope of environmental and musical sounds.…”

Section: Introductionmentioning

confidence: 99%

A robust asymmetry in loudness between rising- and falling-intensity tones

Ponsot

Susini

Meunier

2015

Atten Percept Psychophys

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Tones rising in intensity over a few seconds are perceived as louder than symmetrical tones falling in intensity. However, the causes for such perceptual asymmetry, as well as its magnitude and dependency on contextual and methodological factors remain unclear. In this paper, two psychophysical experiments were conducted to measure the magnitude of this asymmetry for 2-s, 15-dB intensity-varying tones in different conditions. In the first experiment, participants assessed the global loudness of rising-and falling-intensity sounds with an absolute magnitude estimation procedure (AME); in the second experiment, they compared sounds relatively in an adaptive, two-interval, two-alternative forcedchoice task (2I-2AFC). In both experiments, the region of intensity change, the design of experimental blocks, and the type of comparison stimulus were systematically manipulated to test for contextual and methodological factors. Remarkably, the asymmetry was virtually unaffected by the different contexts of presentation and similar results with 2I-2AFC and AME measurements were obtained. In addition, the size of the effect was comparable over all but the highest intensity regions (80-90 dB SPL), at which it was significantly smaller. All together, these results indicate that the loudness asymmetry is preserved under different measurement methods and contexts, and suggest that the underlying mechanism is strong and robust. In short, falling tones have to be about 4 dB higher in level than symmetrically rising tones in order to be perceived with the same global loudness, a finding that is still not predicted by current loudness models.

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“…Asymmetric neural responses to ramped and damped sinusoids also have been measured in the inferior colliculus (Neuert et al, 2001) and auditory cortex (Lu et al, 2001). Although it is difficult to make strong comparisons due to differences in the techniques used across the various studies, the asymmetry in the stimulus representation may be enhanced by each subsequent higher auditory center.…”

Section: Introductionmentioning

confidence: 99%

Investigating temporal asymmetry using masking period patterns and models of peripheral auditory processing

Lentz

Shen

2011

The Journal of the Acoustical Society of America

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Two experiments were conducted in conjunction with modeling to evaluate the role of peripheral nonlinearity and neural adaptation in the perception of temporally asymmetric sounds. In both experiments, maskers were broadband noises amplitude modulated with ramped and damped exponential modulators that repeated at 40 Hz. Masking period patterns (MPPs) were constructed by measuring detection threshold of a 5-ms, 1000-Hz tone burst as function of the signal's onset delay. Experiment I showed that varying modulator half-life from 1 to 16 ms led to differences in the damped and the ramped MPPs that were largest at the short half-lives and diminished at the longer half-lives. When masker level was varied (experiment II), the largest difference between ramped and damped MPPs occurred at moderate stimulus levels. Two peripheral auditory models were evaluated, one a simple auditory filter followed by a power-law nonlinearity and another, a model of auditory nerve processing [J. Acoust. Soc. Am. 126, 2390-2412 (2009)] that includes neural adaptation. Neither models predicted differences between the ramped and damped MPPs, providing indirect support that the central auditory system has a role in perceptual temporal asymmetry.

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The responses of single units in the inferior colliculus of the guinea pig to damped and ramped sinusoids

Cited by 26 publications

References 21 publications

Neural Processing of Amplitude-Modulated Sounds

Neural Processing of Amplitude-Modulated Sounds

A robust asymmetry in loudness between rising- and falling-intensity tones

Investigating temporal asymmetry using masking period patterns and models of peripheral auditory processing

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