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Volumn 22, Issue 7, 2012, Pages 1604-1613

Lateralized auditory cortical alpha band activity and interregional connectivity pattern reflect anticipation of target sounds

Author keywords

frontal eye field; MEG; phase coupling; spatial attention; synchronization

Indexed keywords

ADULT; ANTICIPATION; ARTICLE; AUDITORY CORTEX; AUDITORY STIMULATION; AUDITORY SYSTEM; BEHAVIOR; BRAIN REGION; FEMALE; FRONTAL EYE FIELD; HUMAN; HUMAN EXPERIMENT; MAGNETOENCEPHALOGRAPHY; MALE; NORMAL HUMAN; PRIORITY JOURNAL; VISUAL STIMULATION; VISUAL SYSTEM;

EID: 84862890589     PISSN: 10473211     EISSN: 14602199     Source Type: Journal    
DOI: 10.1093/cercor/bhr232     Document Type: Article
Times cited : (75)

References (67)
  • 1
    • 0035154577 scopus 로고    scopus 로고
    • Event-related desynchronization during anticipatory attention for an upcoming stimulus: A comparative EEG/MEG study
    • Bastiaansen MC, Böcker KB, Brunia CH, Munck JC, Spekreijse H. 2001. Event-related desynchronization during anticipatory attention for an upcoming stimulus: a comparative EEG/MEG study. Clinical Neurophysiology. 112:393-403.
    • (2001) Clinical Neurophysiology , vol.112 , pp. 393-403
    • Bastiaansen, M.C.1    Böcker, K.B.2    Brunia, C.H.3    Munck, J.C.4    Spekreijse, H.5
  • 2
    • 58149381984 scopus 로고    scopus 로고
    • Visual activation and audiovisual interactions in the auditory cortex during speech perception: Intracranial recordings in humans
    • Besle J, Fischer C, Bidet-Caulet A, Lecaignard F, Bertrand O, Giard M. 2008. Visual activation and audiovisual interactions in the auditory cortex during speech perception: intracranial recordings in humans. J. Neurosci. 28:14301-14310.
    • (2008) J. Neurosci , vol.28 , pp. 14301-14310
    • Besle, J.1    Fischer, C.2    Bidet-Caulet, A.3    Lecaignard, F.4    Bertrand, O.5    Giard, M.6
  • 3
    • 3042523540 scopus 로고    scopus 로고
    • Neuronal oscillations in cortical networks
    • Buzsáki G, Draguhn A. 2004. Neuronal oscillations in cortical networks. Science. 304:1926-1929.
    • (2004) Science , vol.304 , pp. 1926-1929
    • Buzsáki, G.1    Draguhn, A.2
  • 5
    • 65949090738 scopus 로고    scopus 로고
    • Frontoparietal cortex controls spatial attention through modulation of anticipatory alpha rhythms
    • Capotosto P, Babiloni C, Romani GL, Corbetta M. 2009. Frontoparietal cortex controls spatial attention through modulation of anticipatory alpha rhythms. J. Neurosci. 29:5863-5872.
    • (2009) J. Neurosci , vol.29 , pp. 5863-5872
    • Capotosto, P.1    Babiloni, C.2    Romani, G.L.3    Corbetta, M.4
  • 6
    • 33751350496 scopus 로고
    • PsyScope: An interactive graphical system for designing and controlling experiments in the psychology laboratory using macintosh computers
    • Cohen J, MacWhinney B, Flatt M, Provost J. 1993. PsyScope: an interactive graphical system for designing and controlling experiments in the psychology laboratory using macintosh computers. Behav Res Methods Instrum Comput. 25:257-271.
    • (1993) Behav Res Methods Instrum Comput , vol.25 , pp. 257-271
    • Cohen, J.1    MacWhinney, B.2    Flatt, M.3    Provost, J.4
  • 7
    • 0036517313 scopus 로고    scopus 로고
    • Control of goal-directed and stimulusdriven attention in the brain
    • Corbetta M, Shulman GL. 2002. Control of goal-directed and stimulusdriven attention in the brain. Nat Rev Neurosci. 3:201-215.
    • (2002) Nat Rev Neurosci , vol.3 , pp. 201-215
    • Corbetta, M.1    Shulman, G.L.2
  • 9
    • 0035490101 scopus 로고    scopus 로고
    • Dynamic predictions: Oscillations and synchrony in top-down processing
    • Engel AK, Fries P, Singer W. 2001. Dynamic predictions: oscillations and synchrony in top-down processing. Nat Rev Neurosci. 2:704-716.
    • (2001) Nat Rev Neurosci , vol.2 , pp. 704-716
    • Engel, A.K.1    Fries, P.2    Singer, W.3
  • 10
    • 84862843925 scopus 로고
    • Functions of the auditory system
    • Barlow HB, Mollon JD, editors Cambridge (UK): Cambridge University Press.
    • Evans E. 1982. Functions of the auditory system. In: Barlow HB, Mollon JD, editors. The senses. Cambridge (UK): Cambridge University Press. p. 307-333.
    • (1982) The Senses , pp. 307-333
    • Evans, E.1
  • 11
    • 33745587302 scopus 로고    scopus 로고
    • Spontaneous neuronal activity distinguishes human dorsal and ventral attention systems
    • Fox MD, Corbetta M, Snyder AZ, Vincent JL, Raichle ME. 2006. Spontaneous neuronal activity distinguishes human dorsal and ventral attention systems. Proc Natl Acad Sci USA. 103:10046-10051.
    • (2006) Proc Natl Acad Sci USA , vol.103 , pp. 10046-10051
    • Fox, M.D.1    Corbetta, M.2    Snyder, A.Z.3    Vincent, J.L.4    Raichle, M.E.5
  • 12
    • 0032238916 scopus 로고    scopus 로고
    • Parieto-occipital approximately 10 Hz activity reflects anticipatory state of visual attention mechanisms
    • Foxe JJ, Simpson GV, Ahlfors SP. 1998. Parieto-occipital approximately 10 Hz activity reflects anticipatory state of visual attention mechanisms. Neuroreport. 9:3929-3933.
    • (1998) Neuroreport , vol.9 , pp. 3929-3933
    • Foxe, J.J.1    Simpson, G.V.2    Ahlfors, S.P.3
  • 13
    • 25144464991 scopus 로고    scopus 로고
    • A mechanism for cognitive dynamics: Neuronal communication through neuronal coherence
    • Fries P. 2005. A mechanism for cognitive dynamics: neuronal communication through neuronal coherence. Trends Cogn Sci. 9:474-480.
    • (2005) Trends Cogn Sci , vol.9 , pp. 474-480
    • Fries, P.1
  • 14
    • 33745044194 scopus 로고    scopus 로고
    • Is neocortex essentially multisensory?
    • Ghazanfar AA, Schroeder CE. 2006. Is neocortex essentially multisensory? Trends Cogn Sci. 10:278-285.
    • (2006) Trends Cogn Sci , vol.10 , pp. 278-285
    • Ghazanfar, A.A.1    Schroeder, C.E.2
  • 15
    • 66349096611 scopus 로고    scopus 로고
    • High-frequency, long-range coupling between prefrontal and visual cortex during attention
    • Gregoriou GG, Gotts SJ, Zhou H, Desimone R. 2009. High-frequency, long-range coupling between prefrontal and visual cortex during attention. Science. 324:1207-1210.
    • (2009) Science , vol.324 , pp. 1207-1210
    • Gregoriou, G.G.1    Gotts, S.J.2    Zhou, H.3    Desimone, R.4
  • 18
    • 0032957150 scopus 로고    scopus 로고
    • A sensor-weighted overlappingsphere head model and exhaustive head model comparison for MEG
    • Huang MX, Mosher JC, Leahy RM. 1999. A sensor-weighted overlappingsphere head model and exhaustive head model comparison for MEG. Phys Med Biol. 44:423-440.
    • (1999) Phys Med Biol , vol.44 , pp. 423-440
    • Huang, M.X.1    Mosher, J.C.2    Leahy, R.M.3
  • 19
    • 27944498170 scopus 로고    scopus 로고
    • Reading the hippocampal code by theta phase-locking
    • Jensen O. 2005. Reading the hippocampal code by theta phase-locking. Trends in cognitive sciences. 9:551-553.
    • (2005) Trends in Cognitive Sciences , vol.9 , pp. 551-553
    • Jensen, O.1
  • 20
    • 79651473046 scopus 로고    scopus 로고
    • Shaping functional architecture by oscillatory activity: Gating by inhibition
    • Jensen O, Mazaheri A. 2010. Shaping functional architecture by oscillatory activity: gating by inhibition. Front Hum Neurosci. 4:1-8.
    • (2010) Front Hum Neurosci , vol.4 , pp. 1-8
    • Jensen, O.1    Mazaheri, A.2
  • 21
    • 0034039283 scopus 로고    scopus 로고
    • Mechanisms of visual attention in the human cortex
    • Kastner S, Ungerleider LG. 2000. Mechanisms of visual attention in the human cortex. Annu Rev Neurosci. 23:315-341.
    • (2000) Annu Rev Neurosci , vol.23 , pp. 315-341
    • Kastner, S.1    Ungerleider, L.G.2
  • 22
    • 70350786675 scopus 로고    scopus 로고
    • Phase resetting as a mechanism for supramodal attentional control
    • Kayser C. 2009. Phase resetting as a mechanism for supramodal attentional control. Neuron. 64:300-302.
    • (2009) Neuron , vol.64 , pp. 300-302
    • Kayser, C.1
  • 23
    • 45849135548 scopus 로고    scopus 로고
    • Visual modulation of neurons in auditory cortex
    • Kayser C, Petkov CI, Logothetis NK. 2008. Visual modulation of neurons in auditory cortex. Cereb Cortex. 18:1560-1574.
    • (2008) Cereb Cortex , vol.18 , pp. 1560-1574
    • Kayser, C.1    Petkov, C.I.2    Logothetis, N.K.3
  • 24
    • 33744901153 scopus 로고    scopus 로고
    • Increases in alpha oscillatory power reflect an active retinotopic mechanism for distracter suppression during sustained visuospatial attention
    • Kelly SP, Lalor EC, Reilly RB, Foxe JJ. 2006. Increases in alpha oscillatory power reflect an active retinotopic mechanism for distracter suppression during sustained visuospatial attention. J. Neurophysiol. 95:3844-3851.
    • (2006) J. Neurophysiol , vol.95 , pp. 3844-3851
    • Kelly, S.P.1    Lalor, E.C.2    Reilly, R.B.3    Foxe, J.J.4
  • 25
    • 74949141572 scopus 로고    scopus 로고
    • Attentional gain control of ongoing cortical speech representations in a "cocktail party"
    • Kerlin JR, Shahin AJ, Miller LM. 2010. Attentional gain control of ongoing cortical speech representations in a "cocktail party". J. Neurosci. 30:620-628.
    • (2010) J. Neurosci , vol.30 , pp. 620-628
    • Kerlin, J.R.1    Shahin, A.J.2    Miller, L.M.3
  • 26
    • 33845315253 scopus 로고    scopus 로고
    • EEG alpha oscillations: The inhibition-timing hypothesis
    • Klimesch W, Sauseng P, Hanslmayr S. 2007a. EEG alpha oscillations: the inhibition-timing hypothesis. Brain Res Rev. 53:63-88.
    • (2007) Brain Res Rev , vol.53 , pp. 63-88
    • Klimesch, W.1    Sauseng, P.2    Hanslmayr, S.3
  • 29
    • 41749085748 scopus 로고    scopus 로고
    • Entrainment of neuronal oscillations as a mechanism of attentional selection
    • Lakatos P, Karmos G, Mehta AD, Ulbert I, Schroeder CE. 2008. Entrainment of neuronal oscillations as a mechanism of attentional selection. Science. 320:110-113.
    • (2008) Science , vol.320 , pp. 110-113
    • Lakatos, P.1    Karmos, G.2    Mehta, A.D.3    Ulbert, I.4    Schroeder, C.E.5
  • 31
    • 0031039762 scopus 로고    scopus 로고
    • Evidence for reactive magnetic 10-Hz rhythm in the human auditory cortex
    • LehteläL, Salmelin R, Hari R. 1997. Evidence for reactive magnetic 10-Hz rhythm in the human auditory cortex. Neurosci Lett. 222:111-114.
    • (1997) Neurosci Lett , vol.222 , pp. 111-114
    • Lehteläl Salmelin, R.1    Hari, R.2
  • 32
    • 33645732941 scopus 로고    scopus 로고
    • The neural networks underlying endogenous auditory covert orienting and reorienting
    • Mayer AR, Harrington D, Adair JC, Lee R. 2006. The neural networks underlying endogenous auditory covert orienting and reorienting. Neuroimage. 30:938-949.
    • (2006) Neuroimage , vol.30 , pp. 938-949
    • Mayer, A.R.1    Harrington, D.2    Adair, J.C.3    Lee, R.4
  • 33
    • 0015021890 scopus 로고
    • The assessment and analysis of handedness: The Edinburgh inventory
    • Oldfield RC. 1971. The assessment and analysis of handedness: the Edinburgh inventory. Neuropsychologia. 9:97-113.
    • (1971) Neuropsychologia , vol.9 , pp. 97-113
    • Oldfield, R.C.1
  • 34
    • 0029885193 scopus 로고    scopus 로고
    • Location and function of the human frontal eye-field: A selective review
    • Paus T. 1996. Location and function of the human frontal eye-field: a selective review. Neuropsychologia. 34:475-483.
    • (1996) Neuropsychologia , vol.34 , pp. 475-483
    • Paus, T.1
  • 37
    • 77952659582 scopus 로고    scopus 로고
    • Onset timing of cross-sensory activations and multisensory interactions in auditory and visual sensory cortices
    • Raij T, Ahveninen J, Lin FH, et al. 2010. Onset timing of cross-sensory activations and multisensory interactions in auditory and visual sensory cortices. Eur J Neurosci. 31:1772-1782.
    • (2010) Eur J Neurosci , vol.31 , pp. 1772-1782
    • Raij, T.1    Ahveninen, J.2    Lin, F.H.3
  • 38
    • 33847043999 scopus 로고    scopus 로고
    • Mechanisms of selective inhibition in visual spatial attention are indexed by alpha-band EEG synchronization
    • Rihs TA, Michel CM, Thut G. 2007. Mechanisms of selective inhibition in visual spatial attention are indexed by alpha-band EEG synchronization. Eur J Neurosci. 25:603-610.
    • (2007) Eur J Neurosci , vol.25 , pp. 603-610
    • Rihs, T.A.1    Michel, C.M.2    Thut, G.3
  • 39
    • 55149089266 scopus 로고    scopus 로고
    • A bias for posterior alpha-band power suppression versus enhancement during shifting versus maintenance of spatial attention
    • Rihs TA, Michel CM, Thut G. 2009. A bias for posterior alpha-band power suppression versus enhancement during shifting versus maintenance of spatial attention. Neuroimage. 44:190-199.
    • (2009) Neuroimage , vol.44 , pp. 190-199
    • Rihs, T.A.1    Michel, C.M.2    Thut, G.3
  • 40
    • 38049132745 scopus 로고    scopus 로고
    • Resting electroencephalogram alpha-power over posterior sites indexes baseline visual cortex excitability
    • Romei V, Rihs T, Brodbeck V, Thut G. 2008. Resting electroencephalogram alpha-power over posterior sites indexes baseline visual cortex excitability. Neuroreport. 19:203-208.
    • (2008) Neuroreport , vol.19 , pp. 203-208
    • Romei, V.1    Rihs, T.2    Brodbeck, V.3    Thut, G.4
  • 41
    • 0035432365 scopus 로고    scopus 로고
    • Correlated neuronal activity and the flow of neural information
    • Salinas E, Sejnowski TJ. 2001. Correlated neuronal activity and the flow of neural information. Nat Rev Neurosci. 2:539-550.
    • (2001) Nat Rev Neurosci , vol.2 , pp. 539-550
    • Salinas, E.1    Sejnowski, T.J.2
  • 42
    • 67849135030 scopus 로고    scopus 로고
    • Brain networks of bottom-up triggered and top-down controlled shifting of auditory attention
    • Salmi J, Rinne T, Koistinen S, Salonen O, Alho K. 2009. Brain networks of bottom-up triggered and top-down controlled shifting of auditory attention. Brain Res. 1286:155-164.
    • (2009) Brain Res , vol.1286 , pp. 155-164
    • Salmi, J.1    Rinne, T.2    Koistinen, S.3    Salonen, O.4    Alho, K.5
  • 44
    • 15944410613 scopus 로고    scopus 로고
    • Neuronal coherence as a mechanism of effective corticospinal interaction
    • Schoffelen JM, Oostenveld R, Fries P. 2005. Neuronal coherence as a mechanism of effective corticospinal interaction. Science. 308:111-113.
    • (2005) Science , vol.308 , pp. 111-113
    • Schoffelen, J.M.1    Oostenveld, R.2    Fries, P.3
  • 45
    • 23044480166 scopus 로고    scopus 로고
    • Multisensory contributions to low-level 'unisensory' processing
    • Schroeder CE, Foxe J. 2005. Multisensory contributions to low-level, 'unisensory' processing. Curr Opin Neurobiol. 15:454-458.
    • (2005) Curr Opin Neurobiol , vol.15 , pp. 454-458
    • Schroeder, C.E.1    Foxe, J.2
  • 46
    • 30044433695 scopus 로고    scopus 로고
    • Selective visual attention and perceptual coherence
    • Serences JT, Yantis S. 2006. Selective visual attention and perceptual coherence. Trends Cogn Sci. 10:38-45.
    • (2006) Trends Cogn Sci , vol.10 , pp. 38-45
    • Serences, J.T.1    Yantis, S.2
  • 47
    • 32544449602 scopus 로고    scopus 로고
    • Parietal cortex mediates voluntary control of spatial and nonspatial auditory attention
    • Shomstein S, Yantis S. 2006. Parietal cortex mediates voluntary control of spatial and nonspatial auditory attention. J. Neurosci. 26:435-439.
    • (2006) J. Neurosci , vol.26 , pp. 435-439
    • Shomstein, S.1    Yantis, S.2
  • 48
    • 56349137173 scopus 로고    scopus 로고
    • Neuronal synchronization along the dorsal visual pathway reflects the focus of spatial attention
    • Siegel M, Donner TH, Oostenveld R, Fries P, Engel AK. 2008. Neuronal synchronization along the dorsal visual pathway reflects the focus of spatial attention. Neuron. 60:709-719.
    • (2008) Neuron , vol.60 , pp. 709-719
    • Siegel, M.1    Donner, T.H.2    Oostenveld, R.3    Fries, P.4    Engel, A.K.5
  • 49
    • 0032830151 scopus 로고    scopus 로고
    • Neuronal synchrony: A versatile code for the definition of relations?
    • Singer W. 1999. Neuronal synchrony: a versatile code for the definition of relations? Neuron. 24:49-65111-125.
    • (1999) Neuron , vol.24 , pp. 111-125
    • Singer, W.1
  • 51
    • 64549163191 scopus 로고    scopus 로고
    • Repetitive transcranial magnetic stimulation over frontal eye fields disrupts visually cued auditory attention
    • Smith DT, Jackson SR, Rorden C. 2009. Repetitive transcranial magnetic stimulation over frontal eye fields disrupts visually cued auditory attention. Brain Stimul. 2:81-87.
    • (2009) Brain Stimul , vol.2 , pp. 81-87
    • Smith, D.T.1    Jackson, S.R.2    Rorden, C.3
  • 52
    • 77949716589 scopus 로고    scopus 로고
    • Anticipatory attentional suppression of visual features indexed by oscillatory alpha-band power increases: A highdensity electrical mapping study
    • Snyder AC, Foxe JJ. 2010. Anticipatory attentional suppression of visual features indexed by oscillatory alpha-band power increases: a highdensity electrical mapping study. J. Neurosci. 30:4024-4032.
    • (2010) J. Neurosci , vol.30 , pp. 4024-4032
    • Snyder, A.C.1    Foxe, J.J.2
  • 54
    • 0242475106 scopus 로고    scopus 로고
    • Lateralization of auditory-cortex functions
    • Tervaniemi M, Hugdahl K. 2003. Lateralization of auditory-cortex functions. Brain Res Rev. 43:231-246.
    • (2003) Brain Res Rev , vol.43 , pp. 231-246
    • Tervaniemi, M.1    Hugdahl, K.2
  • 55
    • 79952381375 scopus 로고    scopus 로고
    • Cross-modal phase reset predicts auditory task performance in humans
    • Thorne JD, De Vos M, Viola FC, Debener S. 2011. Cross-modal phase reset predicts auditory task performance in humans. J. Neurosci. 31:3853-3861.
    • (2011) J. Neurosci , vol.31 , pp. 3853-3861
    • Thorne, J.D.1    De Vos, M.2    Viola, F.C.3    Debener, S.4
  • 56
    • 33748714335 scopus 로고    scopus 로고
    • Alpha-band electroencephalographic activity over occipital cortex indexes visuospatial attention bias and predicts visual target detection
    • Thut G, Nietzel A, Brandt SA, Pascual-Leone A. 2006. Alpha-band electroencephalographic activity over occipital cortex indexes visuospatial attention bias and predicts visual target detection. J. Neurosci. 26:9494-9502.
    • (2006) J. Neurosci , vol.26 , pp. 9494-9502
    • Thut, G.1    Nietzel, A.2    Brandt, S.A.3    Pascual-Leone, A.4
  • 57
    • 84984552597 scopus 로고    scopus 로고
    • Localization of brain electrical activity via linearly constrained minimum variance spatial filtering
    • Van Veen B, van Drongelen W, Yuchtman M, Suzuki A. 1997. Localization of brain electrical activity via linearly constrained minimum variance spatial filtering. IEEE Trans Biomed Eng. 44: 867-80.
    • (1997) IEEE Trans Biomed Eng , vol.44 , pp. 867-880
    • Van Veen, B.1    Van Drongelen, W.2    Yuchtman, M.3    Suzuki, A.4
  • 59
    • 30644460358 scopus 로고    scopus 로고
    • Listening in silence activates auditory areas: A functional magnetic resonance imaging study
    • Voisin J, Bidet-Caulet A, Bertrand O, Fonlupt P. 2006. Listening in silence activates auditory areas: a functional magnetic resonance imaging study. J. Neurosci. 26:273-278.
    • (2006) J. Neurosci , vol.26 , pp. 273-278
    • Voisin, J.1    Bidet-Caulet, A.2    Bertrand, O.3    Fonlupt, P.4
  • 61
    • 35349020516 scopus 로고    scopus 로고
    • The relevance of spontaneous activity for the coding of the tinnitus sensation
    • Weisz N, Dohrmann K, Elbert T. 2007. The relevance of spontaneous activity for the coding of the tinnitus sensation. Prog Brain Res. 166:61-70.
    • (2007) Prog Brain Res , vol.166 , pp. 61-70
    • Weisz, N.1    Dohrmann, K.2    Elbert, T.3
  • 63
    • 31144441349 scopus 로고    scopus 로고
    • Top-down gain control of the auditory space map by gaze control circuitry in the barn owl
    • Winkowski DE, Knudsen EI. 2006. Top-down gain control of the auditory space map by gaze control circuitry in the barn owl. Nature. 439:336-339.
    • (2006) Nature , vol.439 , pp. 336-339
    • Winkowski, D.E.1    Knudsen, E.I.2
  • 65
    • 17344390295 scopus 로고    scopus 로고
    • Anticipatory biasing of visuospatial attention indexed by retinotopically specific alpha-band electroencephalography increases over occipital cortex
    • Worden MS, Foxe JJ, Wang N, Simpson GV. 2000. Anticipatory biasing of visuospatial attention indexed by retinotopically specific alpha-band electroencephalography increases over occipital cortex. J. Neurosci. 20:1-6.
    • (2000) J. Neurosci , vol.20 , pp. 1-6
    • Worden, M.S.1    Foxe, J.J.2    Wang, N.3    Simpson, G.V.4
  • 66
    • 33846373092 scopus 로고    scopus 로고
    • The neural circuitry underlying the executive control of auditory spatial attention
    • Wu CT, Weissman DH, Roberts KC, Woldorff MG. 2007. The neural circuitry underlying the executive control of auditory spatial attention. Brain Res. 1134:187-198.
    • (2007) Brain Res , vol.1134 , pp. 187-198
    • Wu, C.T.1    Weissman, D.H.2    Roberts, K.C.3    Woldorff, M.G.4
  • 67
    • 0035882466 scopus 로고    scopus 로고
    • Spatial localization after excision of human auditory cortex
    • Zatorre RJ, Penhune VB. 2001. Spatial localization after excision of human auditory cortex. J. Neurosci. 21:6321-6328.
    • (2001) J. Neurosci , vol.21 , pp. 6321-6328
    • Zatorre, R.J.1    Penhune, V.B.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.