Songbird frequency selectivity and temporal resolution vary with sex and season

Gall, Megan D.; Salameh, Therese S.; Lucas, Jeffrey R.

doi:10.1098/rspb.2012.2296

Cited by 36 publications

(21 citation statements)

References 49 publications

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“…All the animals used in the current study were male. Since sex effects have been observed across species both in ABRs as well as EFRs (Jerger and Hall 1980;Eggermont and Don 1982;Krizman et al 2012;Gall et al 2013), the presence of such effects with these stimuli and any changes with age remain a valid avenue of investigation. The canonical correlations used in this study are sensitive only to the presence of a linear relationship amongst the variables.…”

Section: Discussionmentioning

confidence: 99%

Age-Related Changes in the Relationship Between Auditory Brainstem Responses and Envelope-Following Responses

Parthasarathy

Datta

Torres

et al. 2014

JARO

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Hearing thresholds and wave amplitudes measured using auditory brainstem responses (ABRs) to brief sounds are the predominantly used clinical measures to objectively assess auditory function. However, frequency-following responses (FFRs) to tonal carriers and to the modulation envelope (envelope-following responses or EFRs) to longer and spectro-temporally modulated stimuli are rapidly gaining prominence as a measure of complex sound processing in the brainstem and midbrain. In spite of numerous studies reporting changes in hearing thresholds, ABR wave amplitudes, and the FFRs and EFRs under neurodegenerative conditions, including aging, the relationships between these metrics are not clearly understood. In this study, the relationships between ABR thresholds, ABR wave amplitudes, and EFRs are explored in a rodent model of aging. ABRs to broadband click stimuli and EFRs to sinusoidally amplitude-modulated noise carriers were measured in young (3-6 months) and aged (22-25 months) Fischer-344 rats. ABR thresholds and amplitudes of the different waves as well as phase-locking amplitudes of EFRs were calculated. Age-related differences were observed in all these measures, primarily as increases in ABR thresholds and decreases in ABR wave amplitudes and EFR phaselocking capacity. There were no observed correlations between the ABR thresholds and the ABR wave amplitudes. Significant correlations between the EFR amplitudes and ABR wave amplitudes were observed across a range of modulation frequencies in the young. However, no such significant correlations were found in the aged. The aged click ABR amplitudes were found to be lower than would be predicted using a linear regression model of the young, suggesting altered gain mechanisms in the relationship between ABRs and FFRs with age. These results suggest that ABR thresholds, ABR wave amplitudes, and EFRs measure complementary aspects of overlapping neurophysiological processes and the relationships between these measurements changes asymmetrically with age. Hence, measuring all three metrics provides a more complete assessment of auditory function, especially under pathological conditions like aging.

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Section: Discussionmentioning

confidence: 99%

Age-Related Changes in the Relationship Between Auditory Brainstem Responses and Envelope-Following Responses

Parthasarathy

Datta

Torres

et al. 2014

JARO

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“…The threshold is then estimated as lying halfway between this stimulus intensity and the next lowest intensity (in our case, 2.5 dB below the stimulus intensity of the last detectable response). This method consistently produces evoked potential thresholds that provide the greatest agreement with thresholds estimated with single unit or behavioural estimates [17,21,29].…”

Section: (B) General Experimental Proceduresmentioning

confidence: 87%

“…Although often considered a relatively stable component of the auditory system, there is evidence that the peripheral auditory (ear and auditory nerve) responses can change in threshold or other neural response measures across reproductive state or following experimental manipulation of hormonal levels [15][16][17]. In the current study, we ask whether social experience in the form of exposure to conspecific vocal signals over several days could modify the auditory periphery's response to novel calls or other acoustic stimuli.…”

Section: Introductionmentioning

confidence: 99%

Hearing conspecific vocal signals alters peripheral auditory sensitivity

Gall

Wilczynski

2015

Proc. R. Soc. B.

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We investigated whether hearing advertisement calls over several nights, as happens in natural frog choruses, modified the responses of the peripheral auditory system in the green treefrog, Hyla cinerea. Using auditory evoked potentials (AEP), we found that exposure to 10 nights of a simulated male chorus lowered auditory thresholds in males and females, while exposure to random tones had no effect in males, but did result in lower thresholds in females. The threshold change was larger at the lower frequencies stimulating the amphibian papilla than at higher frequencies stimulating the basilar papilla. Suprathreshold responses to tonal stimuli were assessed for two peaks in the AEP recordings. For the peak P1 (assessed for 0.8-1.25 kHz), peak amplitude increased following chorus exposure. For peak P2 (assessed for 2-4 kHz), peak amplitude decreased at frequencies between 2.5 and 4.0 kHz, but remained unaltered at 2.0 kHz. Our results show for the first time, to our knowledge, that hearing dynamic social stimuli, like frog choruses, can alter the responses of the auditory periphery in a way that could enhance the detection of and response to conspecific acoustic communication signals.

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“…There is considerable work showing that there are seasonal and hormonally induced changes in peripheral auditory sensitivity in fish, frogs and songbirds (Coffin et al, 2012;Gall et al, 2013;Henry and Lucas, 2009;Miranda and Wilczynski, 2009;Rohmann et al, 2013;Sisneros et al, 2004;Vélez et al, 2015;Zhang et al, 2012). In these taxa, breeding attempts occur seasonally and attention to matingrelated stimuli increases in importance during these times.…”

Section: Forward Masking and Socially Induced Plasticitymentioning

confidence: 99%

The effects of call-like masking diminish after nightly exposure to conspecific choruses in green treefrogs (Hyla cinerea)

Gall

Wilczynski

2016

Journal of Experimental Biology

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One of the major difficulties encountered by animals that select mates using acoustic signals is discriminating individual calls from the background noise generated by other conspecifics. Reducing the effects of conspecific masking could improve discrimination of individual calls from background noise. We used auditory evoked potentials to investigate the effects of forward masking on the responses to artificial calls in male and female treefrogs (Hyla cinerea), as well as whether hearing advertisement calls over several nights, as happens in natural frog choruses, could modify the effects of masking. We found that response amplitude decreased with decreasing interstimulus interval when the masker was equal in amplitude to the stimulus. We also found evidence of a priming effect, whereby response amplitude at lower masker amplitudes was greater than when the target stimulus was not preceded by a masker. Finally, we found that the effect of masking was diminished by 10 nights of chorus exposure (i.e. responses were stronger to target stimuli), whereas there was no change in response in the control group. Our results show that hearing dynamic social stimuli, such as frog choruses, can alter the responses of the auditory periphery in a way that could enhance the detection of and response to conspecific acoustic communication signals.

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Songbird frequency selectivity and temporal resolution vary with sex and season

Cited by 36 publications

References 49 publications

Age-Related Changes in the Relationship Between Auditory Brainstem Responses and Envelope-Following Responses

Age-Related Changes in the Relationship Between Auditory Brainstem Responses and Envelope-Following Responses

Hearing conspecific vocal signals alters peripheral auditory sensitivity

The effects of call-like masking diminish after nightly exposure to conspecific choruses in green treefrogs (Hyla cinerea)

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