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Can Anodal Transcranial Direct Current Stimulation Increase Steady-State Visual Evoked Potential Responses?

Kim DW, Kim E, Lee C, Im CH

BACKGROUND: It has been frequently reported that non-negligible numbers of individuals have steady-state visual evoked potential (SSVEP) responses of low signal-to-noise-ratio (SNR) to specific stimulation frequencies, which makes detection of...
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Layer-specific cholinergic modulation of synaptic transmission in layer 2/3 pyramidal neurons of rat visual cortex

Cho KH, Lee SY, Joo K, Rhie DJ

It is known that top-down associative inputs terminate on distal apical dendrites in layer 1 while bottom-up sensory inputs terminate on perisomatic dendrites of layer 2/3 pyramidal neurons (L2/3 PyNs)...
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The Influence of Contrasts on Directional and Spatial Frequency Tuning in Visual Cortex Areas 17/18 of the Cat

Kim JN

PURPOSE: The purpose of this study was to investigate the effects of contrast display exposure on neuronal directional and spatial frequency tuning. Neuronal responses were recorded from ninety-four neurons in...
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The Development of Phasic and Tonic Inhibition in the Rat Visual Cortex

Jang HJ, Cho KH, Park SW, Kim MJ, Yoon SH, Rhie DJ

Gamma-aminobutyric acid (GABA)-ergic inhibition is important in the function of the visual cortex. In a previous study, we reported a developmental increase in GABAA receptor-mediated inhibition in the rat visual...
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Effects of Serotonin on the Induction of Long-term Depression in the Rat Visual Cortex

Jang HJ, Cho KH, Park SW, Kim MJ, Yoon SH, Rhie DJ

Long-term potentiation (LTP) and long-term depression (LTD) have both been studied as mechanisms of ocular dominance plasticity in the rat visual cortex. In a previous study, we suggested that a...
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Temporal Changes of Direction and Spatial Frequency Tuning in Visual Cortex Areas 17 and 18

Kim JN

Spatial frequency and direction tuning to drifting sinusoidal gratings are intrinsic properties of neurons in visual cortex neurons in areas 17 and 18. To investigate the stability of these tuning...
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c-fos Immunoreactivity at the Auditory and Visual Cortex in Experimentally Induced Deafness in Guinea Pigs

Park YH, Lee KO, Kim SI, Park JY, Koo BS, Kim YM, Rha KS

  • KMID: 2141199
  • Korean J Otorhinolaryngol-Head Neck Surg.
  • 2008 Jul;51(7):602-608.
BACKGROUND AND OBJECTIVES: Recently, functional studies for auditory cortex are being watched with interest in accordance with development of many radiologic equipments and surgical devices for sensorineural hearing loss. Moreover,...
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Combined Application of Bicuculline and 4-Aminopyridine-Induced Epileptiform Activity are Resistant to Conventional Anticonvulsants and AMPA in Young Rat Visual Cortex

Choi BJ

  • KMID: 1816508
  • J Korean Epilepsy Soc.
  • 2006 Jun;10(1):35-40.
PURPOSE: The goal of the present study was to find out whether blockade of GABAergic synaptic transmission by bicuculline (BIC) in the presence of 4-aminopyridine (4-AP) would lead to expression...
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In Vitro Effect of Carbamazepine, D-(-)-2-Amino-5-Phosphonopentanoic Acid and 6-Cyano-7-Nitroquinoxaline-Dione on Pentylenetetrazole-Induced Epileptiform Activity in Young Rat Visual Cortex

Choi BJ

  • KMID: 1851944
  • J Korean Epilepsy Soc.
  • 2005 Dec;9(2):137-142.
PURPOSE: Carbamazepine (CBZ) has little untoward effect in behavior, cognition and psychosocial aspects and commonly used in children. But, CBZ can sometimes worsen tonic-clonic seizures. The goal of the present...
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Effects of Divalproex sodium for Visual Cortex Excitability in Migraine: A Study Using Transcranial Magnetic Stimulation

Kang BW, Kim EH, Lee HW, Kim JI, Jung DK, Suh CK, Park SP

  • KMID: 2137942
  • J Korean Neurol Assoc.
  • 2004 Oct;22(5):499-503.
BACKGROUND: The pathophysiology of migraine has not been fully understood. One of the hypotheses is cortical hyperexcitability. Transcranial magnetic stimulation (TMS) is a noninvasive electrophysiologic tool for the investigation of...
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Changes of beta-Adrenergic Receptor mRNA in the Visual Cortex and Superior Colliculus of Monocular Deprivated Rat

Shim JH, Seo SW, Yoo JM

  • KMID: 2337152
  • J Korean Ophthalmol Soc.
  • 2004 Sep;45(9):1554-1559.
PURPOSE: To investigate the change of the Beta adrenergic system in the rat visual cortex and superior colliculus after visual deprivation during a critical period of postnatal development. METHODS: The...
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Monoaminergic Activity by Drugs Acting on Adrenergic alpha2-receptors in Rat Hippocampus and Primary Visual Cortex

Kim HG, Lee YC, Paik KC, Lim MH, Kim HW, Kang BJ

  • KMID: 2286867
  • Korean J Psychopharmacol.
  • 2004 Sep;15(3):371-379.
OBJECTIVE: The aim of the this study was to compare the effects of clonidine (a alpha2-adrenoceptor and imidazoline receptor agonist), yohimbine (a selective alpha2-adrenoceptor antagonist) and idazoxan (a alpha2-adrenoceptor and...
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Electrophysiological Analysis of Deafferentation Effect on Visual Cortex in Rats

Kim SJ, Kim SH, Yu YS, Chung H, Chang BL

  • KMID: 1902565
  • J Korean Ophthalmol Soc.
  • 2004 Mar;45(3):513-521.
PURPOSE: Temporary deafferentation (TD) by local anesthesia in small parts of the body induces an immediate and reVersible reorganization of the receptive field (RF). It is thought that an adaptation...
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Electrophysiological and Morphological Classification of Inhibitory Interneurons in Layer II/III of the Rat Visual Cortex

Rhie DJ, Kang HY, Ryu GR, Kim MJ, Yoon SH, Hahn SJ, Min DS, Jo YH, Kim MS

  • KMID: 1607516
  • Korean J Physiol Pharmacol.
  • 2003 Dec;7(6):317-323.
Interneuron diversity is one of the key factors to hinder understanding the mechanism of cortical neural network functions even with their important roles. We characterized inhibitory interneurons in layer II/III...
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A Case of Positron Emission Tomogram(PET) study in Head Injury with Visual Field Defect

Kim SH, Ohn YH, Jung HY

  • KMID: 2125034
  • J Korean Ophthalmol Soc.
  • 2001 Jun;42(6):916-921.
PURPOSE: We report a case of head injury patient that showed a typical glucose hypometabolism in Positron Emission Tomogram(PET). But that case shows no abnormal finding in ophthalmological and radiological...
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Comparison of Activation in the Primary Visual Cortex between Anisometropic and Strabismic Amblyopias using Functional MRI

Choi MY, Lee KM, Hwang JM, Choi DG, Park KH, Yu YS

  • KMID: 2205694
  • J Korean Ophthalmol Soc.
  • 1999 Dec;40(12):3450-3459.
The purpose of the present study is to examine neural responses of the primary visual cortex[V1] in patients with anisometropic and strabismic amblyopias, using functional MRI[fMRI]. Fourteen amblyopias[8 anisometropic and...
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A Preliminary Results of Acoustic Noise Effect due to Gradient Pulsing in Functional MRI

Chung ST, Song IC, Park HW

  • KMID: 1543787
  • J Korean Soc Magn Reson Med.
  • 1999 Sep;3(3):257-264.
PURPOSE: In functional MRI(fMRI), the acoustic noise effects of gradient pulsing are analyzed with two different combinations of readout and phase-encoding gradients for sagittal-view images. MATERIALS AND METHODS: Series of...
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The Study on the Role of NMDA Receptors in Rat Visual Cortex

Yoon YD, Lim JO, Shin DE

  • KMID: 1949967
  • J Korean Ophthalmol Soc.
  • 1992 Sep;33(9):819-826.
The amino acid L-glutamate is a major excitatory neurotransmitter in central nervous system of vertebrates. NMDA( n-methyl-d-aspartate) is one of the L-glutamate receptor subtypes. During a critical period of early...
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A study on the role of N-methyl-D-aspartate receptors in the rat visual cortex

Lim JO, Yoon YD, Shin DE

The amino acid L-glutamate is a major excitatory neurotransmitter in the central nervous system of vertebrates(1). NMDA (N-methyl-d-aspartate) is one of the L-glutamate receptor subtypes(2). During a critical period of...
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