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Phase-dependent effects of stimuli locked to oscillatory activity in cultured cortical networks
- Source :
- Biophysical journal, 98(11), 2452-2458. Biophysical Society
- Publication Year :
- 2009
-
Abstract
- The archetypal activity pattern in cultures of dissociated neurons is spontaneous network-wide bursting. Bursts may interfere with controlled activation of synaptic plasticity, but can be suppressed by the application of stimuli at a sufficient rate. We sinusoidally modulated (4 Hz) the pulse rate of random background stimulation (RBS) and found that cultures were more active, burst less frequently, and expressed oscillatory activity. Next, we studied the effect of phase-locked tetani (four pulses, 200 s−1) on network activity. Tetani were applied to one electrode at the peak or trough of mRBS stimulation. We found that when tetani were applied at the peak of modulated RBS (mRBS), a significant potentiation of poststimulus histograms (PSTHs) occurred. Conversely, tetani applied at the trough resulted in a small but insignificant depression of PSTHs. In addition to PSTHs, electrode-specific firing rate profiles within spontaneous bursts before and after mRBS were analyzed. Here, significant changes in firing rate profiles were found only for stimulation at the peak of mRBS. Our study shows that rhythmic activity in culture is possible, and that the network responds differentially to strong stimuli depending on the phase at which they are delivered. This suggests that plasticity mechanisms may be differentially accessible in an oscillatory state.
- Subjects :
- Periodicity
Time Factors
Biophysics
Action Potentials
Stimulation
Plasticity
Biology
Bursting
Rhythm
Neuroplasticity
Neural Pathways
medicine
Animals
Rats, Wistar
Cells, Cultured
Cerebral Cortex
Neuronal Plasticity
Long-term potentiation
Anatomy
Electric Stimulation
Biological Systems and Multicellular Dynamics
Rats
medicine.anatomical_structure
Cerebral cortex
Synaptic plasticity
Microelectrodes
Subjects
Details
- ISSN :
- 15420086 and 00063495
- Volume :
- 98
- Issue :
- 11
- Database :
- OpenAIRE
- Journal :
- Biophysical journal
- Accession number :
- edsair.doi.dedup.....5ec0eeb77c60491de15519f7bccf6db2