Filters








88 Hits in 5.6 sec

GABAergic Excitation of Spider Mechanoreceptors Increases Information Capacity by Increasing Entropy Rather than Decreasing Jitter

K. Pfeiffer, A. S. French
2009 Journal of Neuroscience  
We measured action potential firing produced by random mechanical stimulation of spider mechanoreceptor neurons during long-duration excitation by the GABAA agonist muscimol.  ...  Information capacity was also estimated from the coherence function between input and output signals.  ...  The same responses were also converted to the frequency domain to estimate the coherence function and thus another estimate of information capacity.  ... 
doi:10.1523/jneurosci.2744-09.2009 pmid:19726657 pmcid:PMC6665533 fatcat:fvnfqiqrejdcbppwhynnvf7ar4

Page 1594 of The Journal of Neuroscience Vol. 25, Issue 6 [page]

2005 The Journal of Neuroscience  
Octopamine effects on frequency response and coherence functions of a spider trichobothria neuron.  ...  A, Sensitivity; k, fractional exponent; R, information capacity; n, number of experiments. the stimulated neuron to the recording wires caused a time delay, At, adding a frequency-dependent phase lag of  ... 

The Efficiency of Sensory Information Coding by Mechanoreceptor Neurons

Mikko Juusola, Andrew S French
1997 Neuron  
potential, should be tuned to enhance important stimulus frequencies and to limit the effects of noise.  ...  For the Department of Physiology and Biophysics mechanoreceptor neurons used in the present study, Dalhousie University we have already shown that the earliest stages of the Halifax, Nova Scotia B3H 4H7  ...  than quency response, coherence, and SNR functions (see below) of the twice the signal bandwidth (1000-2500 Hz), digitized with a 12-bit spider mechanoreceptor neurons were reliably measured within the  ... 
doi:10.1016/s0896-6273(00)80335-9 pmid:9208863 fatcat:6tjzir2y7zdthhsghrel4i6f3e

Spider Peripheral Mechanosensory Neurons Are Directly Innervated and Modulated by Octopaminergic Efferents

A. Widmer
2005 Journal of Neuroscience  
Frequency response analysis showed that octopamine increased the sensitivity of the trichobothria neurons over a broad frequency range.  ...  In addition, octopamine enhances the electrical response of the sensory neurons to mechanical stimulation. Spider peripheral mechanosensilla receive extensive efferent innervation.  ...  To learn whether this effect varied with stimulus frequency and whether it also affected the information capacities of these neurons, we performed frequency response analysis from nine experiments in which  ... 
doi:10.1523/jneurosci.4505-04.2005 pmid:15703413 fatcat:evqhvrag6zerpn7oosvszz7wii

Naturalistic stimulation changes the dynamic response of action potential encoding in a mechanoreceptor

Keram Pfeiffer, Andrew S. French
2015 Frontiers in Physiology  
Both naturalistic and Gaussian noise signals were used to mechanically stimulate VS-3 slit-sense mechanoreceptor neurons of the spider, Cupiennius salei, with stimulus amplitudes adjusted to give similar  ...  Frequency response analysis showed that naturalistic stimulation contained relatively more power at low frequencies, and caused increased neuronal sensitivity to higher frequencies.  ...  Martin Göpfert and his coworkers, University of Göttingen, Germany, for providing access to laser Doppler vibrometry equipment, and assisting in its use.  ... 
doi:10.3389/fphys.2015.00303 pmid:26578975 pmcid:PMC4626565 fatcat:ftpuocupnnh5za56h44qg6cm4m

Active Signal Conduction through the Sensory Dendrite of a Spider Mechanoreceptor Neuron

Ewald Gingl, Andrew S. French
2003 Journal of Neuroscience  
Frequency-response measurements between pseudorandom mechanical stimulation and somatic membrane potential estimated the passive cable properties of the dendrite for voltage spread in the opposite direction  ...  The VS-3 slit-sense organ of the spider Cupiennius salei contains bipolar mechanosensory neurons that allow voltage-clamp recording from the somata, whereas mechanotransduction occurs at the tips of 100  ...  Parameters of Equation 2 obtained by fitting frequency-response functions from five VS-3 neurons. Dendrite lengths, x, were measured by microscopy (Fig. 4) .  ... 
doi:10.1523/jneurosci.23-14-06096.2003 pmid:12853428 fatcat:vjugobtnojftpmd5yaobwnzzuy

Random Stimulation of Spider Mechanosensory Neurons Reveals Long-Lasting Excitation by GABA and Muscimol

Keram Pfeiffer, Izabela Panek, Ulli Höger, Andrew S. French, Päivi H. Torkkeli
2009 Journal of Neurophysiology  
During the final excitatory phase, VS-3 neuron sensitivity to high-frequency signals increased selectively and their linear information capacity also increased.  ...  Random stimulation of spider mechanosensory neurons reveals long-lasting excitation by GABA and muscimol. nobutyric acid type A (GABA A ) receptor activation inhibits many primary afferent neurons by depolarization  ...  Frequency response and coherence function measurements revealed that the neurons' overall sensitivity, selectivity for frequencies Ͼ10 Hz, and information capacity increased during the long-lasting excitatory  ... 
doi:10.1152/jn.91020.2008 pmid:19004993 fatcat:lp6owcwcr5hbbnlgotxa5clvem

Page 2321 of The Journal of Neuroscience Vol. 25, Issue 9 [page]

2005 The Journal of Neuroscience  
French AS, Héger U, Sekizawa SI, Torkkeli PH (2001 functions and information capacities of paired spider mechanoreceptor 2001) Ef- Frequency response neurons. Biol Cybern 85:293—300.  ...  Redundancy reduction and sus Input-driven components of spike-frequency Hagedorn M, Heiligenberg W (1985) Court and spark: electric signals in the symnotoid fish.  ... 

Activation of GABAA receptors modulates all stages of mechanoreception in spider mechanosensory neurons

Keram Pfeiffer, Päivi H. Torkkeli, Andrew S. French
2012 Journal of Neurophysiology  
We calculated frequency response functions between each stage, estimated 21 information as signal entropy, and information capacity from coherence. Since coherence is sensitive 22  ...  We used muscimol to activate GABA A receptors in 18 spider VS-3 neurons and measured the dynamic behavior independently and separately at each of 19 three stages of mechanoreception (receptor current,  ...  Information capacity was estimated from: 147 R = ∫log 2 (1/(1-γ 2 ( f ))) d f (2), 148 (Juusola and French 1997) . 149 Frequency response functions between mechanical stimulation and receptor current  ... 
doi:10.1152/jn.00717.2011 pmid:21957226 fatcat:zjogxl57trfe5kdhhvaytepka4

Active touch in orthopteroid insects: behaviours, multisensory substrates and evolution

C. Comer, Y. Baba
2011 Philosophical Transactions of the Royal Society of London. Biological Sciences  
Some orthopteroids possess long, mobile antennae endowed with many chemo-and mechanoreceptors. When the antennae are touched, an animal's response depends upon the identity of the stimulus.  ...  Some of the visual interneurons and the motor neurons necessary for visuomotor control have been identified.  ...  The GIs are directionally selective in responding to wind, and information from at least four bilateral pairs of GIs is integrated to specify the appropriate direction of an evasive turn away from a lunging  ... 
doi:10.1098/rstb.2011.0149 pmid:21969682 pmcid:PMC3172593 fatcat:jlb7xbo6vbaepcaiyow7ox77pq

Dynamic Properties of Antennal Responses to Pheromone in Two Moth Species

Kristine A. Justus, Ring T. Cardé, Andrew S. French
2005 Journal of Neurophysiology  
Frequency response functions and coherence functions between PID and EAG signals were used to measure the dynamic responses of the two species to pheromone blends and individual components.  ...  We stimulated male antennae of two moth species, Cadra cautella and Spodoptera exigua, with pheromone plumes in a wind tunnel while recording electroantennograms (EAG) and concentration of a surrogate  ...  Berhane for rearing colonies of C. cautella and S. exigua. We also thank P. Torkkeli and J. Allison for critical reading of the manuscript.  ... 
doi:10.1152/jn.00888.2004 pmid:15537812 fatcat:anzv6hwvzzaphfsbbhi7lz3uzy

Mechanics to pre-process information for the fine tuning of mechanoreceptors

Friedrich G. Barth
2019 Journal of Comparative Physiology A. Sensory, neural, and behavioral physiology  
The present review deals with mechanoreceptors mainly of invertebrates and some remarkable recent findings stressing the role of mechanics as an important source of sensor adaptedness, outstanding performance  ...  They filter the stimulus and transform it in a way that fits the animal's needs, thereby contributing to the avoidance of the central nervous system's overload with meaningless stimuli and a corresponding  ...  I am also grateful to many colleagues, students, and associates for their enthusiasm and interest in spider mechanoreceptors and sensory biology in general.  ... 
doi:10.1007/s00359-019-01355-z pmid:31270587 pmcid:PMC6726712 fatcat:zw7jjfrmkzeihpkfuy36ux4rwe

Smelling, feeling, tasting and touching: behavioral and neural integration of antennular chemosensory and mechanosensory inputs in the crayfish

D. Mellon
2012 Journal of Experimental Biology  
the deutocerebrum, whether they target common or separate brain neurons, and the nature, if any, of their functional relationships to the aesthetasc and hydrodynamic sensilla.  ...  as antennules, and (2) a much longer, uniramous pair, the 2nd antennae, or just ʻantennae'.  ...  Acknowledgements I am grateful for the technical assistance and expertise of Ms Jan Redick, whose efforts are largely responsible for the previously unpublished scanning electron micrographs and the transmission  ... 
doi:10.1242/jeb.069492 pmid:22675176 fatcat:q2g6ieoysjbqjhrwcbaqahxxw4

Some recent advances in spider sensory physiology

Andrew French, Päivi Torkkeli
2015 Physiology News  
Acknowledgements This work is funded by the NIH, BBSRC, and European Union Horizon 2020.  ...  Modulation of spider mechanoreceptor neurons Animals are bombarded by vast amounts of sensory information from their external and internal environments but only relevant information is delivered to the  ...  One of the most fascinating properties of spider peripheral mechanoreceptors is the abundant and complex efferent innervation that reaches even the most peripherally located parts of the sensory neurons  ... 
doi:10.36866/pn.99.34 fatcat:aucmie324vfe5n2p3s5bj6vuvi

Information Rate and Spike-Timing Precision of Proprioceptive Afferents

Ralph A. DiCaprio, Cyrus P. Billimoria, Björn Ch. Ludwar
2007 Journal of Neurophysiology  
Information rate and spike-timing precision of proprioceptive afferents. .  ...  Information rate was correlated with the mean jitter and the noise entropy of the spike train could be predicted from the mean firing rate and mean jitter.  ...  A similar study of information transfer rates of spider slit sensilla, a mechanoreceptor detecting cuticular strain, estimated an information transfer rate of over 2,000 bits/s for the graded receptor  ... 
doi:10.1152/jn.00176.2007 pmid:17634343 fatcat:tiv7ttpc6fcytborcw472si5ei
« Previous Showing results 1 — 15 out of 88 results