Abstract:
:1. Many examples of long-term potentiation (LPT) are induced by repetitive electrical stimulation of presynaptic axons. LTP also is induced by direct glutamate iontophoresis (1 M, 1-2 microA, 10 s) onto postsynaptic neurons in hippocampal slices without evoked presynaptic stimulation; this form of LTP is called "ionto-LTP". The studies herein test the hypothesis that ionto-LTP is expressed primarily through postsynaptic mechanisms. 2. Whole cell recordings were used to examine the amplitude and frequency of spontaneous excitatory postsynaptic currents (sEPSCs) in CA1 pyramidal neurons. sEPSCs were composed of an equal mixture of tetrodotoxin (TTX)-insensitive miniature EPSCs and EPSCs that appeared to result from spontaneous action potentials (i.e., TTX-sensitive EPSCs). The detection of all sEPSCs was virtually eliminated by 6-cyano-7-nitroquinoxaline-2,3-dione (20 microM), suggesting that sEPSCs were glutamate-mediated synaptic events. 3. Changes in the amplitude and frequency of sEPSCs were examined during the expression of ionto-LTP to obtain new information about the cellular location of mechanisms involved in synaptic plasticity. Our findings show that ionto-LTP expression results in increased sEPSC amplitude in the absence of lasting increases in sEPSC frequency. 4. Potentiation of sEPSC amplitude without changes in sEPSC frequency has been previously interpreted to be due to postsynaptic mechanisms. Although this interpretation is supported by findings from peripheral synapses, its application to the central nervous system is unclear. We have considered alternative mechanisms. Models based on increased release probability for action potential dependent transmitter release appeared insufficient to explain our results. The most straightforward interpretation of our results is that LTP induced by glutamate iontophoresis on dendrites of CA1 pyramidal neurons is mediated largely by postsynaptic changes.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Cormier RJ,Kelly PTdoi
10.1152/jn.1996.75.5.1909subject
Has Abstractpub_date
1996-05-01 00:00:00pages
1909-18issue
5eissn
0022-3077issn
1522-1598journal_volume
75pub_type
杂志文章abstract::The dorsal nucleus of the lateral lemniscus (DNLL) receives afferent inputs from many brain stem nuclei and, in turn, is a major source of inhibitory inputs to the inferior colliculus (IC). The goal of this study was to characterize the monaural and binaural response properties of neurons in the DNLL of unanesthetized...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00451.2007
更新日期:2007-09-01 00:00:00
abstract::1. Monkeys were trained to react to an arm perturbation according to an instruction delivered prior to the perturbation. There were two possible instructions (push or pull), and monkeys learned to respond accordingly regardless of the direction (push or pull) of the triggering perturbation. 2. Pyramidal tract neurons ...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1976.39.5.1069
更新日期:1976-09-01 00:00:00
abstract::During anticipated postural perturbations induced by limb movement, the central nervous system generates anticipatory postural adjustments (APAs) in the trunk and hip musculature to minimize disturbances to equilibrium. Age-related changes in functional organization of the nervous system may contribute to changes in A...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00428.2018
更新日期:2018-12-01 00:00:00
abstract::1. We investigated gamma-aminobutyric acid (GABA) receptors using thin slice patch-clamp techniques in the swellings along axons of posterior pituitary nerve terminals. 2. Activation of the nerve terminal GABAA receptor induced a mean conductance change of 1.5 nS. Normalizing to area gave a mean conductance density of...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1995.73.3.1135
更新日期:1995-03-01 00:00:00
abstract::Intracellular Ca2+ is influenced by both Ca2+ influx and release. We examined intracellular Ca2+ following action potential firing in the bag cell neurons of Aplysia californica. Following brief synaptic input, these neuroendocrine cells undergo an afterdischarge, resulting in elevated Ca2+ and the secretion of neurop...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.90356.2008
更新日期:2008-07-01 00:00:00
abstract::The role of the nitric oxide (NO)-cGMP signaling cascade in modulation of peripheral nociception is controversial. Although behavioral studies have suggested both pro- and anti-nociceptive effects, little is known about the direct action of this signaling cascade on primary afferent nociceptive neurons that mediate th...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00058.2004
更新日期:2004-08-01 00:00:00
abstract::A pair of antagonistic thermoreceptive cells is associated with each of two peg-in-pit sensilla located on the antennal tip of Aedes aegypti. One, the warm cell, responds to rapid warming with a sudden increase in the rate of discharge. The other, a cold cell, responds to rapid cooling with a sudden increase in the di...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.01164.2004
更新日期:2005-07-01 00:00:00
abstract::1. Neuron-specific expression of alternately spliced exons of the gene encoding the Phe-Met-Arg-Phe-NH2 (FMRFamide) family of neuropeptides and the role of encoded peptides in synaptic transmission were examined in an identified cardiorespiratory interneuron, the visceral white interneuron (VWI), in the snail Lymnaea....
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1993.69.3.915
更新日期:1993-03-01 00:00:00
abstract::Sensorineural hearing loss (SNHL) causes an overall deficit in binaural hearing, including the abilities to localize sound sources, discriminate interaural time and level differences (ITDs and ILDs, respectively), and utilize binaural cues to aid signal detection and comprehension in noisy environments. Few studies ha...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00349.2020
更新日期:2020-10-01 00:00:00
abstract::Mechanoreceptors of the crayfish tail fan have peripheral somata and send their axons to the last (sixth) abdominal ganglion via five bilateral pairs of nerve roots (R1-R5). Comparisons were made between normal crayfish and regenerate preparations in which R4 had been cut and directed back to an extensively denervated...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1985.54.2.385
更新日期:1985-08-01 00:00:00
abstract::1. We studied the blocking properties of a spider (Nephila clavata) toxin (JSTX) purified from venom on the spiny lobster neuromuscular junction. 2. When a small amount of JSTX was applied to the neuromuscular junction, the excitatory postsynaptic potential (EPSP) was partially suppressed. The amplitude of EPSPs remai...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1987.58.2.319
更新日期:1987-08-01 00:00:00
abstract::The ventroposterior region of the thalamus of mongrel cats was searched to locate zones activated by somatic stimuli. By using stimuli that selectively excited Pacinian corpuscles, areas activated by this class of afferent fibers were differentiated from regions activated by other classes of cutaneous mechanoreceptors...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1986.56.6.1475
更新日期:1986-12-01 00:00:00
abstract::1. Passive hyperpolarizing potentials (PHPs) have been recorded intracellularly from goldfish medullary neurons in the vicinity of the Mauthner cell (M-cell). They are evoked when this cell is activated antidromically by stimulation of the spinal cord, and orthodromically via the ipsilateral eighth nerve; when appropr...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1975.38.2.452
更新日期:1975-03-01 00:00:00
abstract::During priming of pop-out, performance at discriminating a pop-out feature target in visual search is affected by whether the target on the previous trial was defined by the same feature as on the upcoming trial. Recent studies suggest that priming of pop-out relies on attentional processes. With the use of simultaneo...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00121.2011
更新日期:2011-12-01 00:00:00
abstract::1. The hyperpolarization that follows tetanic stimulation was recorded intra-axonally from the internodal region of intramuscular myelinated motor axons. 2. The peak amplitude of the posttetanic hyperpolarization (PTH) that followed stimulation at 20-100 Hz for < or = 35 s increased with increasing train duration, rea...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1993.70.5.1874
更新日期:1993-11-01 00:00:00
abstract::Odorants induce specific modulation of mitral/tufted (MT) cells' firing rate in the mammalian olfactory bulb (OB), inducing temporal patterns of neuronal discharge embedded in an oscillatory local field potential (LFP). While most studies have examined anesthetized animals, little is known about the firing rate and te...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00095.2008
更新日期:2008-07-01 00:00:00
abstract::Fear conditioning involves the transmission of sensory stimuli to the amygdala from the thalamus and cortex. These input synapses are prime candidates for sites of plasticity critical to the learning in fear conditioning. Because N-methyl-D-aspartate (NMDA)-dependent mechanisms have been implicated in fear learning, w...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1999.81.2.930
更新日期:1999-02-01 00:00:00
abstract::Recent advances in recording and computing hardware have enabled laboratories to record the electrical activity of multiple brain regions simultaneously. Lagging behind these technical advances, however, are the methods needed to rapidly produce microdrives and head-caps that can flexibly accommodate different recordi...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00955.2014
更新日期:2015-04-01 00:00:00
abstract::1. Somatic K currents of cultured hippocampal, striatal, and spinal cord neurons of embryonic rat were recorded under voltage clamp in membrane spheres ("blebs") excised by means of a tight-seal pipette. 2. The somatic K current in blebs was subject to rapid and near complete inactivation during 300-ms depolarizations...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1992.68.5.1708
更新日期:1992-11-01 00:00:00
abstract::Neurons display a variety of complex dendritic morphologies even within the same class. We examined the relationship between dendritic arborization and the coupling between somatic and dendritic action potential (AP) initiation sites in layer 5 (L5) neocortical pyramidal neurons. Coupling was defined as the relative r...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00046.2003
更新日期:2003-06-01 00:00:00
abstract::Our continuous perception of the world could be the result of discrete sampling, where individual snapshots are seamlessly fused into a coherent stream. It has been argued that endogenous oscillatory brain activity could provide the functional substrate of cortical rhythmic sampling. A new study demonstrates that cort...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00810.2017
更新日期:2018-04-01 00:00:00
abstract::It has been suggested that some cortically blind patients can process the emotional valence of visual stimuli via a fast, subcortical pathway from the superior colliculus (SC) that reaches the amygdala via the pulvinar. We provide in vivo evidence for connectivity between the SC and the amygdala via the pulvinar in bo...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.01016.2014
更新日期:2015-09-01 00:00:00
abstract::When linking in time electrical stimulation of the peripheral nerve with transcranial magnetic stimulation (TMS), the excitability of the motor cortex can be modulated to evoke clear inhibition, as reflected by the amplitude decrement in the motor-evoked potentials (MEPs). This specific property, designated short-late...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00796.2011
更新日期:2012-07-01 00:00:00
abstract::Properties of calcium spikes revealed during GABAA receptor antagonism in hippocampal CA1 neurons from guinea pigs. J. Neurophysiol. 78: 2269-2279, 1997. Intracellular electrical responses and changes in intracellular calcium concentration ([Ca2+]i) in response to activation of synaptic inputs and to DC injections wer...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1997.78.5.2269
更新日期:1997-11-01 00:00:00
abstract::Slow covariations in neuronal resting potentials can lead to artefactually fast cross-correlations in their spike trains. J. Neurophysiol. 80: 3345-3351, 1998. A model of two lateral geniculate nucleus (LGN) cells, which interact only through slow (tens of seconds) covariations in their resting membrane potentials, is...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1998.80.6.3345
更新日期:1998-12-01 00:00:00
abstract::Motoneurons receive synaptic inputs from tens of thousands of connections that cause membrane potential to fluctuate continuously (synaptic noise), which introduces variability in discharge times of action potentials. We hypothesized that the influence of synaptic noise on force steadiness during voluntary contraction...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00938.2011
更新日期:2012-06-01 00:00:00
abstract::The nucleus tractus solitarii (nTS) is the initial central termination site for visceral afferents and is important for modulation and integration of multiple reflexes including cardiorespiratory reflexes. Glutamate is the primary excitatory neurotransmitter in the nTS and is removed from the extracellular milieu by e...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.01054.2015
更新日期:2016-03-01 00:00:00
abstract::Support-surface movements are commonly used to examine balance control. Subjects typically receive a series of identical or randomly interspersed multidirectional balance perturbations and the atypical "first trial reaction" (evoked by the first perturbation) is often excluded from further analysis. However, this proc...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.90945.2008
更新日期:2009-06-01 00:00:00
abstract::1. Although it is generally agreed that Ca2+ couples depolarization to the release of neurotransmitters, hypertonic saline and ethanol (ETOH) evoke neurosecretion independent of extracellular Ca2+. One possible explanation is that these agents release Ca2+ from an intracellular store that then stimulates Ca(2+)-depend...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1992.68.4.1229
更新日期:1992-10-01 00:00:00
abstract::Experiments in both conscious and anesthetized animals indicate that intrathecal (i.t.) strychnine (STR; glycine receptor antagonist) produces acute, reversible allodynia, as evidenced by inappropriate behavioral and autonomic responses to cutaneous tactile stimuli. Although STR is known to produce disinhibition of af...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1997.78.2.628
更新日期:1997-08-01 00:00:00