Neural representation of sound amplitude by functionally different auditory receptors in crickets

Imaizumi, Kazuo; Pollack, Gerald S.

doi:10.1121/1.1348004

Cited by 43 publications

(34 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly if the SPL of a song at either ear was found to be below 40·dB, the behavioural threshold for P. guttiventris females (Mhatre and Balakrishnan, 2006), it was set as being below phonotactic threshold. This provides a dynamic range of nearly 60·dB, within the range observed in the tympanal nerve of Teleogryllus oceanicus (Imaizumi and Pollack, 2001). …”

Section: (Ii) Saturation and Thresholdsupporting

confidence: 51%

Phonotactic walking paths of field crickets in closed-loop conditions and their simulation using a stochastic model

Mhatre

Balakrishnan

2007

Journal of Experimental Biology

View full text Add to dashboard Cite

SUMMARY Field cricket females localize one of many singing males in the field in closed-loop multi-source conditions. To understand this behaviour, field cricket phonotaxis was investigated in a closed-loop walking phonotaxis paradigm, in response to two simultaneously active speakers playing aphasic calling songs. Female phonotactic paths were oriented towards the louder sound sources, but showed great inter-individual variability. Decisions made in the initial phases were correlated with the overall directions of the paths. Interestingly, the sound pressure levels of stimuli did not greatly influence several features of phonotactic paths such as sinuosity, walking bout lengths and durations. In order to ascertain the extent of our understanding of walking phonotaxis, a stochastic model was used to simulate the behaviour observed in the experiment. The model incorporated data from the experiment and our current understanding of field cricket auditory physiology. This model, based on stochastic turning towards the louder side, successfully recaptured several qualitative and quantitative features of the observed phonotactic paths. The simulation also reproduced the paths observed in a separate outdoor field experiment. Virtual crickets that were unilaterally deafened or had poor ear directionality exhibited walking paths similar to those observed in previous experiments.

show abstract

Section: (Ii) Saturation and Thresholdsupporting

confidence: 51%

Phonotactic walking paths of field crickets in closed-loop conditions and their simulation using a stochastic model

Mhatre

Balakrishnan

2007

Journal of Experimental Biology

View full text Add to dashboard Cite

show abstract

“…, with latency Y, stimulus intensity X, minimum latency L min , and latency at threshold L max (Imaizumi and Pollack 2001;Kanneworff 2004). …”

Section: Discussionmentioning

confidence: 99%

Tone and call responses of units in the auditory nerve and dorsal medullary nucleus of Xenopus laevis

Elliott

Christensen‐Dalsgaard

Kelley

2007

J Comp Physiol A

View full text Add to dashboard Cite

The clawed frog Xenopus laevis produces vocalizations consisting of distinct patterns of clicks.This study provides the first description of spontaneous, pure-tone and communication-signal evoked discharge properties of auditory nerve (n.VIII) fibers and dorsal medullary nucleus (DMN) cells in an obligatorily aquatic anuran. Responses of 297 n.VIII and 253 DMN units are analyzed for spontaneous rates (SR), frequency tuning, rate-intensity functions, and firing rate adaptation, with a view to how these basic characteristics shape responses to recorded call stimuli. Response properties generally resemble those in partially terrestrial anurans. Broad tuning exists across characteristic frequencies (CFs). Threshold minima are −101 dB re 1 mm/s at 675 Hz; −87 dB at 1,600 Hz; and −61 dB at 3,000 Hz (−90, −77, and −44 dB re 1 Pa, respectively), paralleling the peak frequency of vocalizations at 1.2-1.6 kHz with ~500 Hz in 3 dB bandwidth. SRs range from 0 to 80 (n.VIII) and 0 to 73 spikes/s (DMN). Nerve and DMN units of all CFs follow click rates in natural calls, ≤67 clicks/s and faster. Units encode clicks with a single spike, double spikes, or bursts. Spike times correlate closely with click envelopes. No temporal filtering for communicative click rates occurs in either n.VIII or the DMN.

show abstract

“…In the auditory field, intensity is always plotted logarithmically on a decibel scale. The cricket's receptors already encode sound linearly on this logarithmic axis (Imaizumi and Pollack, 2001), and thus a shift on the decibel scale is referred to as "subtractive" (Fig. 2).…”

Section: Subtractive and Divisive Adaptationmentioning

confidence: 99%

Multiple Arithmetic Operations in a Single Neuron: The Recruitment of Adaptation Processes in the Cricket Auditory Pathway Depends on Sensory Context

Hildebrandt

Benda²,

Hennig³

2011

J. Neurosci.

View full text Add to dashboard Cite

Sensory pathways process behaviorally relevant signals in various contexts and therefore have to adapt to differing background conditions. Depending on changes in signal statistics, this adjustment might be a combination of two fundamental computational operations: subtractive adaptation shifting a neuron's threshold and divisive gain control scaling its sensitivity. The cricket auditory system has to deal with highly stereotyped conspecific songs at low carrier frequencies, and likely much more variable predator signals at high frequencies. We proposed that due to the differences between the two signal classes, the operation that is implemented by adaptation depends on the carrier frequency. We aimed to identify the biophysical basis underlying the basic computational operations of subtraction and division.We performed in vivo intracellular and extracellular recordings in a first-order auditory interneuron (AN2) that is active in both mate recognition and predator avoidance. We demonstrated subtractive shifts at the carrier frequency of conspecific songs and division at the predator-like carrier frequency. Combined application of current injection and acoustic stimuli for each cell allowed us to demonstrate the subtractive effect of cell-intrinsic adaptation currents. Pharmacological manipulation enabled us to demonstrate that presynaptic inhibition is most likely the source of divisive gain control.We showed that adjustment to the sensory context can depend on the class of signals that are relevant to the animal. We further revealed that presynaptic inhibition is a simple mechanism for divisive operations. Unlike other proposed mechanisms, it is widely available in the sensory periphery of both vertebrates and invertebrates.

show abstract

Neural representation of sound amplitude by functionally different auditory receptors in crickets

Cited by 43 publications

References 59 publications

Phonotactic walking paths of field crickets in closed-loop conditions and their simulation using a stochastic model

Phonotactic walking paths of field crickets in closed-loop conditions and their simulation using a stochastic model

Tone and call responses of units in the auditory nerve and dorsal medullary nucleus of Xenopus laevis

Multiple Arithmetic Operations in a Single Neuron: The Recruitment of Adaptation Processes in the Cricket Auditory Pathway Depends on Sensory Context

Contact Info

Product

Resources

About