Responses of central auditory neurons to frequency-modulated stimuli

Vartanyan, I. A.

doi:10.1007/bf01062414

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…Such direction-selective responses to SFM stimuli were first described in the cat auditory cortex (Evans and Whitfield, 1964) and to linear frequency modulations in the inferior colliculus and auditory cortex of bats (Suga, 1965a, b). The percentages of units in the different response classes that we found were similar to those obtained with linear modulations from the rat inferior colliculus (Vartanian, 1974). In the cat auditory cortex, however, a higher percentage of cells preferring the upward direction (-70%) to the downward direction (-30%) was found (Mendelson and Cynader, 1985;Heil et af., 1992b).…”

Section: Direction-selective Response Propertiessupporting

confidence: 84%

Temporal Coding of Amplitude and Frequency Modulation in the Rat Auditory Cortex

Gaese

Ostwald

1995

Eur J of Neuroscience

138

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The rat primary auditory cortex was explored for neuronal responses to pure tones and sinusoidally amplitude-modulated (SAM) and frequency-modulated (SFM) stimuli. Units showed phase-locked responses to SAM stimulation (55%) and SFM stimulation (80%), with modulation frequencies up to 18 Hz. Tuning characteristics to the modulation frequency were mainly band-pass with best modulation frequencies (BMFs) between 4 and 15 Hz. Units with synchronized activity to SFM stimulation showed three response types with respect to the direction of the frequency modulation: 52% were selective to the upward direction, 30% to the downward direction, and 18% had no preference. Triangular frequency modulations were used to test if units were tuned to specific modulation frequencies or to specific rates of frequency change. In the vast majority of units tested the response characteristics were strongly influenced by varying the modulation frequency, whereas varying the rate of frequency change had little effect in the stimulus range used. Units that showed phase-locked responses to SAM and SFM stimulation had similar activity patterns in response to both types of stimuli. BMFs for SAM and SFM stimulation were significantly correlated. Intrinsic oscillations of up to 20 Hz could be seen in the spontaneous activity and after the stimuli independent of the stimulus type. Oscillation frequencies were significantly correlated with the BMFs of the respective units. The results are discussed in terms of a mechanism for periodicity detection based on a temporal code. This could be important for the recognition of complex acoustic signals.

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Section: Direction-selective Response Propertiessupporting

confidence: 84%

Temporal Coding of Amplitude and Frequency Modulation in the Rat Auditory Cortex

Gaese

Ostwald

1995

Eur J of Neuroscience

138

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“…While we cannot rule out the possibility that some simple additive function of the frequencies in the glides themselves is responsible for the grouping, simply matching the captor to the initial or terminal frequency of a glide is not sufficient to account for the effect observed in condition A. Glide orientation itself seems like a plausible candidate for the basis of grouping in the glided captor conditions. We are encouraged in this interpretation by reports concerning channels in the auditory system sensitive to rate of frequency modulation (Evans & Whitfield, 1964;Vartanian, 1974). Increasing the rate of FM is analogous to increasing the slope of glides.…”

Section: Discussionmentioning

confidence: 97%

Capturing frequency components of glided tones: Frequency separation, orientation, and alignment

Steiger

Bregman

1981

Perception & Psychophysics

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If two sinusoidal glides, Y and Z, synchronous in onset and offset, glide in parallel on a log frequency scale, they fuse and sound like a single rich glide. However, it is possible to capture Y (the target) into a sequential stream by using as a captor a pure tone glide, X, that precedes the YZ glide in a repeating cycle. The cycle then breaks perceptually into two streams, an XY stream and a Z stream. The strength of capturing depends on the similarity of the captor and target glides with respect to both frequency range and orientation. There appears to be no special capturing effect when the captor and target glides are aligned on a common trajectory.

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“…Our recordings in the cochlear nuclei of the rat only demonstrate a negligible DS compared to that of IC neurons: compared to 0.75 of IC neurons, the maximal absolute DSI of CN neurons is 0.21, which is less than 0.33, the criteria for strong direction selectivity. The percentage of DS neurons in the rat's IC has been addressed by several studies that used different FM stimuli and yielded different results, ranging from 10% to 80% (Felsheim and Ostwald, 1996;Poon et al, 1991Poon et al, , 1992Vartanian, 1974 demonstrates an increased correlation of DSI and CF along the ascending auditory pathway (correlation coefficients: À0.12 in CN, À0.73 in CNIC, and À0.81 in MGBv), compared with À0.87 in A1 (Zhang et al, 2003). The ratio of upward direction-selective neurons to downward direction-selective neurons also differs among different species, as well as their correlation with CFs.…”

Section: Ds Neurons In the Auditory Systemmentioning

confidence: 99%

The Generation of Direction Selectivity in the Auditory System

Kuo

2012

Neuron

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Both human speech and animal vocal signals contain frequency-modulated (FM) sounds. Although central auditory neurons that selectively respond to the direction of frequency modulation are known, the synaptic mechanisms underlying the generation of direction selectivity (DS) remain elusive. Here we show the emergence of DS neurons in the inferior colliculus by mapping the three major subcortical auditory nuclei. Cell-attached recordings reveal a highly reliable and precise firing of DS neurons to FM sweeps in a preferred direction. By using in vivo whole-cell current-clamp and voltage-clamp recordings, we found that the synaptic inputs to DS neurons are not direction selective, but temporally reversed excitatory and inhibitory synaptic inputs are evoked in response to opposing directions of FM sweeps. The construction of such temporal asymmetry, resulting DS, and its topography can be attributed to the spectral disparity of the excitatory and the inhibitory synaptic tonal receptive fields.

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Responses of central auditory neurons to frequency-modulated stimuli

Cited by 3 publications

References 8 publications

Temporal Coding of Amplitude and Frequency Modulation in the Rat Auditory Cortex

Temporal Coding of Amplitude and Frequency Modulation in the Rat Auditory Cortex

Capturing frequency components of glided tones: Frequency separation, orientation, and alignment

The Generation of Direction Selectivity in the Auditory System

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