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Contextual impact on sensory processing at the barrel cortex of awake rat

100%
Kublik E.
Acta Neurobiologiae Experimentalis
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2004
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vol. 64
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issue 2
229-238
EN
In order to understand the processing of sensory information in different behavioral situations we recorded evoked potentials (EP) to stimulation of a single vibrissa in the barrel cortex of non-anesthetized rat. We attributed the two principal components of the first negative wave (N1) of the cortical EP to the activation of two pyramidal cell populations (supra- and infragranular) of the central barrel-column. A positive wave of longer latency (P2) reflected the activation of the neighboring columns of the barrel cortex. The EPs recorded continuously throughout the experiment could be sorted into two classes dominated by the activity of either infra- or supragranular pyramidal cells. The introduction of an aversive contextual stimuli increased the amplitude of the second component of the N1 wave, which is built up by activation of infragranular cells, and the amplitude of the P2 wave representing excitation of neighboring columns. We hypothesize that increased activity of infragranular cells activates a cortico-thalamo-cortical loop going through the POm nucleus, which finally excites wider areas of primary somatosensory cortex. This spread of activity enables the comparison of information from neighboring vibrissae at the mystacial pad. The general cortical activation caused by the introduction of the contextual stimuli might be induced by noradrenergic and/or cholinergic systems. Prolonged contextual stimulation causes habituation processes, which return the cortical network to an idle state.
2
Content available remote

Cortical contribution to sensory volleys recorded at thalamic nuclei of lemniscal and paralemniscal pathways

51%
Kublik E., Swiejkowski D. A., Wrobel A.
Acta Neurobiologiae Experimentalis
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2003
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vol. 63
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issue 4
377-382
EN
In order to elucidate the role of cortical input on sensory information processing in different thalamic somatosensory nuclei we recorded potentials evoked (EPs) by whisker deflections of short duration from ventral posteromedial (VPm) and medial posterior (POm) nuclei while manipulating cortico-thalamic activity by means of local cooling, lidocaine application or electrical stimulation. It appeared that only the earliest sub-component of the first negative wave of the EPs resulted from peripheral input, while the rest of the potential?s negativity depended on cortical feedback. The latencies and amplitudes of EPs recorded at both nuclei were not significantly different, which might be attributed to urethane anesthesia.
3
Content available remote

20 Hz bursting beta activity in the cortico-thalmic system of visually attending cats

51%
Wrobel A., Bekisz M., Kublik E., Waleszczyk W.
Acta Neurobiologiae Experimentalis
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1994
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vol. 54
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issue 2
95-107
4
Content available remote

Local classifiers for evoked potentials recorded from behaving rats

51%
Jakuczun W., Kublik E., Wojcik D. K., Wrobel A.
Acta Neurobiologiae Experimentalis
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2005
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vol. 65
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issue 3
425-434
EN
Dynamic states of the brain determine the way information is processed in local neural networks. We have applied classical conditioning paradigm in order to study whether habituated and aroused states can be differentiated in single barrel column of rat's somatosensory cortex by means of analysis of field potentials evoked by stimulation of a single vibrissa. A new method using local classifiers is presented which allows for reliable and meaningful classification of single evoked potentials which might be consequently attributed to different functional states of the cortical column.
5
Content available remote

Rapid phase shift of evoked potentials in barrel cortex accompanies conditioning

45%
Wrobel A., Achimowicz J., Musial P., Kublik E., Krol T.
Acta Neurobiologiae Experimentalis
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1995
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vol. 55
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issue 2
147
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