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Epilepsy Research and Treatment
Volume 2012 (2012), Article ID 204693, 18 pages
http://dx.doi.org/10.1155/2012/204693
Review Article

Role of Electroencephalography in Presurgical Evaluation of Temporal Lobe Epilepsy

1Department of Neurology, Vikram Hospital, Bangalore 560052, India
2Departments of Clinical Neurological Sciences, Medical Imaging, Medical Biophysics, and Psychology, University of Western Ontario, London, ON, Canada N6A 5A5

Received 5 September 2011; Revised 18 January 2012; Accepted 28 June 2012

Academic Editor: Warren T. Blume

Copyright © 2012 Seetharam Raghavendra et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Linked References

  1. S. Wiebe, W. T. Blume, J. P. Girvin, and M. Eliasziw, “A randomized, controlled trial of surgery for temporal-lobe epilepsy,” New England Journal of Medicine, vol. 345, no. 5, pp. 311–318, 2001. View at Publisher · View at Google Scholar · View at Scopus
  2. R. A. Prayson, J. D. Reith, and I. M. Najm, “Mesial temporal sclerosis: a clinicopathologic study of 27 patients, including 5 with coexistent cortical dysplasia,” Archives of Pathology and Laboratory Medicine, vol. 120, no. 6, pp. 532–536, 1996. View at Scopus
  3. L. M. Li, F. Cendes, F. Andermann et al., “Surgical outcome in patients with epilepsy and dual pathology,” Brain, vol. 122, no. 5, pp. 799–805, 1999. View at Publisher · View at Google Scholar · View at Scopus
  4. F. Cendes, M. J. Cook, C. Watson et al., “Frequency and characteristics of dual pathology in patients with lesional epilepsy,” Neurology, vol. 45, no. 11, pp. 2058–2064, 1995. View at Scopus
  5. J. Danckert, S. M. Mirsattari, F. Bihari, S. Danckert, A. A. Allman, and L. Janzen, “Functional MRI characteristics of a focal region of cortical malformation not associated with seizure onset,” Epilepsy and Behavior, vol. 10, no. 4, pp. 615–625, 2007. View at Publisher · View at Google Scholar · View at Scopus
  6. W. T. Blume, J. Ravindran, and N. J. Lowry, “Late lateralizing and localizing EEG features of scalp-recorded temporal lobe seizures,” Journal of Clinical Neurophysiology, vol. 15, no. 6, pp. 514–520, 1998. View at Publisher · View at Google Scholar · View at Scopus
  7. A. Patel, F. Alotaibi, W. T. Blume, and S. M. Mirsattari, “Independent component analysis of subdurally recorded occipital seizures,” Clinical Neurophysiology, vol. 119, no. 11, pp. 2437–2446, 2008. View at Publisher · View at Google Scholar · View at Scopus
  8. W. T. Blume, S. E. Whiting, and J. P. Girvin, “Epilepsy surgery in the posterior cortex,” Annals of Neurology, vol. 29, no. 6, pp. 638–645, 1991. View at Scopus
  9. W. T. Blume, S. Wiebe, and L. M. Tapsell, “Occipital epilepsy: lateral versus mesial,” Brain, vol. 128, no. 5, pp. 1209–1225, 2005. View at Publisher · View at Google Scholar · View at Scopus
  10. P. Gloor, “Preoperative electroencephalographic investigation in temporal lobe epilepsy: extracranial and intracranial recordings,” Canadian Journal of Neurological Sciences, vol. 18, no. 4, pp. 554–558, 1991. View at Scopus
  11. R. M. Sadler and J. Goodwin, “Multiple electrodes for detecting spikes in partial complex seizures,” Canadian Journal of Neurological Sciences, vol. 16, no. 3, pp. 326–329, 1989. View at Scopus
  12. H. H. Jasper, “The ten-twenty electrode system of the International Federation,” Electroencephalography and Clinical Neurophysiology, vol. 10, no. 10, pp. 371–375, 1958.
  13. W. J. Nowack, A. Janati, W. S. Metzer, and J. Nickols, “The anterior temporal electrode in the EEG of the adult,” Clinical EEG Electroencephalography, vol. 19, no. 4, pp. 199–204, 1988. View at Scopus
  14. D. Silverman, R. Bernard, and M. Mellies, “The anterior temporal electrode and the ten-twenty system,” Electroencephalography and Clinical Neurophysiology, vol. 12, no. 3, pp. 735–737, 1960. View at Scopus
  15. W. T. Blume, “The necessity for sphenoidal electrodes in the presurgical evaluation of temporal lobe epilepsy: con position,” Journal of Clinical Neurophysiology, vol. 20, no. 5, pp. 305–310, 2003. View at Publisher · View at Google Scholar · View at Scopus
  16. G. E. Chatrian, E. Lettich, and P. L. Nelson, “Modified nomenclature for the “10%” electrode system.,” Journal of Clinical Neurophysiology, vol. 5, no. 2, pp. 183–186, 1988. View at Scopus
  17. M. R. Sperling and J. Engel Jr, “Electroencephalographic recording from the temporal lobes: a comparison of ear, anterior temporal, and nasopharyngeal electrodes,” Annals of Neurology, vol. 17, no. 5, pp. 510–513, 1985. View at Scopus
  18. M. R. Sperling, J. R. Mendius, and J. Engel Jr, “Mesial temporal spikes: a simultaneous comparison of sphenoidal, nasopharyngeal, and ear electrodes,” Epilepsia, vol. 27, no. 1, pp. 81–86, 1986. View at Scopus
  19. M. Zijlmans, G. M. Huiskamp, A. C. van Huffelen, W. P. J. Spetgens, and F. S. S. Leijten, “Detection of temporal lobe spikes: comparing nasopharyngeal, cheek and anterior temporal electrodes to simultaneous subdural recordings,” Clinical Neurophysiology, vol. 119, no. 8, pp. 1771–1777, 2008. View at Publisher · View at Google Scholar · View at Scopus
  20. G. Alarcón, N. Kissani, M. Dad et al., “Lateralizing and localizing values of ictal onset recorded on the scalp: evidence from simultaneous recordings with intracranial foramen ovale electrodes,” Epilepsia, vol. 42, no. 11, pp. 1426–1437, 2001. View at Publisher · View at Google Scholar · View at Scopus
  21. D. Nilsson, M. Fohlen, C. Jalin, G. Dorfmuller, C. Bulteau, and O. Delalande, “Foramen ovale electrodes in the preoperative evaluation of temporal lobe epilepsy in children,” Epilepsia, vol. 50, no. 9, pp. 2085–2096, 2009. View at Publisher · View at Google Scholar · View at Scopus
  22. T. R. Velasco, A. C. Sakamoto, V. Alexandre Jr et al., “Foramen ovale electrodes can identify a focal seizure onset when surface EEG fails in mesial temporal lobe epilepsy,” Epilepsia, vol. 47, no. 8, pp. 1300–1307, 2006. View at Publisher · View at Google Scholar · View at Scopus
  23. A. Cherian, A. Radhakrishnan, S. Parameswaran, R. Varma, and K. Radhakrishnan, “Do sphenoidal electrodes aid in surgical decision making in drug resistant temporal lobe epilepsy,” Clinical Neurophysiology, vol. 123, no. 3, pp. 463–470, 2012.
  24. N. Kissani, G. Alarcon, M. Dad, C. D. Binnie, and C. E. Polkey, “Sensitivity of recordings at sphenoidal electrode site for detecting seizure onset: evidence from scalp, superficial and deep foramen ovale recordings,” Clinical Neurophysiology, vol. 112, no. 2, pp. 232–240, 2001. View at Publisher · View at Google Scholar · View at Scopus
  25. A. M. Kanner, J. Parra, A. Gil-Nagel et al., “The localizing yield of sphenoidal and anterior temporal electrodes in ictal recordings: a comparison study,” Epilepsia, vol. 43, no. 10, pp. 1189–1196, 2002. View at Publisher · View at Google Scholar · View at Scopus
  26. M. B. Hamaneh, C. Limotai, and H. O. Lüders, “Sphenoidal electrodes significantly change the results of source localization of interictal spikes for a large percentage of patients with temporal lobe epilepsy,” Journal of Clinical Neurophysiology, vol. 28, no. 4, pp. 373–379, 2011.
  27. A. M. Kanner, L. Ramirez, and J. C. Jones, “The utility of placing sphenoidal electrodes under the foramen ovale with fluoroscopic guidance,” Journal of Clinical Neurophysiology, vol. 12, no. 1, pp. 72–81, 1995. View at Scopus
  28. R. J. Wilkus and P. M. Thompson, “Sphenoidal electrode positions and basal EEG during long term monitoring,” Epilepsia, vol. 26, no. 2, pp. 137–142, 1985. View at Scopus
  29. W. T. Blume, J. L. Borghesi, and J. F. Lemieux, “Interictal indices of temporal seizure origin,” Annals of Neurology, vol. 34, no. 5, pp. 703–709, 1993. View at Publisher · View at Google Scholar · View at Scopus
  30. E. Pataraia, S. Lurger, W. Serles et al., “Ictal scalp EEG in unilateral mesial temporal lobe epilepsy,” Epilepsia, vol. 39, no. 6, pp. 608–614, 1998. View at Publisher · View at Google Scholar · View at Scopus
  31. F. Cendes, L. M. Li, C. Watson, F. Andermann, F. Dubeau, and D. L. Arnold, “Is ictal recording mandatory in temporal lobe epilepsy? Not when the interictal electroencephalogram and hippocampal atrophy coincide,” Archives of Neurology, vol. 57, no. 4, pp. 497–500, 2000. View at Scopus
  32. N. M. G. Bodde, J. L. Brooks, G. A. Baker et al., “Psychogenic non-epileptic seizures-definition, etiology, treatment and prognostic issues: a critical review,” Seizure, vol. 18, no. 8, pp. 543–553, 2009. View at Publisher · View at Google Scholar · View at Scopus
  33. M. Pfänder, S. Arnold, A. Henkel et al., “Clinical features and EEG findings differentiating mesial from neocortical temporal lobe epilepsy,” Epileptic Disorders, vol. 4, no. 3, pp. 189–195, 2002. View at Scopus
  34. H. M. Hamer, I. Najm, A. Mohamed, and E. Wyllie, “Interictal epileptiform discharges in temporal lobe epilepsy due to hippocampal sclerosis versus medial temporal lobe tumors,” Epilepsia, vol. 40, no. 9, pp. 1261–1268, 1999. View at Publisher · View at Google Scholar · View at Scopus
  35. C. Aykut-Bingol, R. A. Bronen, J. H. Kim, D. D. Spencer, and S. S. Spencer, “Surgical outcome in occipital lobe epilepsy: implications for pathophysiology,” Annals of Neurology, vol. 44, no. 1, pp. 60–69, 1998. View at Publisher · View at Google Scholar · View at Scopus
  36. N. Tandon, A. V. Alexopoulos, A. Warbel, I. M. Najm, and W. E. Bingaman, “Occipital epilepsy: spatial categorization and surgical management: clinical article,” Journal of Neurosurgery, vol. 110, no. 2, pp. 306–318, 2009. View at Publisher · View at Google Scholar · View at Scopus
  37. F. Cendes, F. Dubeau, F. Andermann et al., “Significance of mesial temporal atrophy in relation to intracranial ictal and interictal stereo EEG abnormalities,” Brain, vol. 119, no. 4, pp. 1317–1326, 1996. View at Scopus
  38. M. Sadler and R. Desbiens, “Scalp EEG in temporal lobe epilepsy surgery,” Canadian Journal of Neurological Sciences, vol. 27, no. 1, pp. S22–S28, 2000. View at Scopus
  39. R. Schulz, H. O. Lüders, M. Hoppe, I. Tuxhorn, T. May, and A. Ebner, “Interictal EEG and ictal scalp EEG propagation are highly predictive of surgical outcome in mesial temporal lobe epilepsy,” Epilepsia, vol. 41, no. 5, pp. 564–570, 2000. View at Scopus
  40. M. Y. Chung, T. S. Walczak, D. V. Lewis, D. V. Dawson, and R. Radtke, “Temporal lobectomy and independent bitemporal interictal activity: what degree of lateralization is sufficient?” Epilepsia, vol. 32, no. 2, pp. 195–201, 1991. View at Scopus
  41. A. Hufnagel, C. E. Elger, H. Pels et al., “Prognostic significance of ictal and interictal epileptiform activity in temporal lobe epilepsy,” Epilepsia, vol. 35, no. 6, pp. 1146–1153, 1994. View at Publisher · View at Google Scholar · View at Scopus
  42. A. Koukou, S. Dupont, W. Szurhaj, M. Baulac, P. Derambure, and C. Adam, “Complete change of seizure and spike lateralization in temporal lobe epilepsy at two separate monitorings,” Clinical Neurophysiology, vol. 118, no. 2, pp. 255–261, 2007. View at Publisher · View at Google Scholar · View at Scopus
  43. M. D. Holmes, A. N. Miles, C. B. Dodrill, G. A. Ojemann, and A. J. Wilensky, “Identifying potential surgical candidates in patients with evidence of bitemporal epilepsy,” Epilepsia, vol. 44, no. 8, pp. 1075–1079, 2003. View at Publisher · View at Google Scholar · View at Scopus
  44. P. Halász, J. Janszky, G. Y. Rásonyi et al., “Postoperative interictal spikes during sleep contralateral to the operated side is associated with unfavourable surgical outcome in patients with preoperative bitemporal spikes.,” Seizure, vol. 13, no. 7, pp. 460–466, 2004. View at Scopus
  45. B. J. Steinhoff, N. K. So, S. Lim, and H. O. Luders, “Ictal scalp EEG in temporal lobe epilepsy with unitemporal versus bitemporal interictal epileptiform discharges,” Neurology, vol. 45, no. 5, pp. 889–896, 1995. View at Scopus
  46. R. M. Sadler and W. T. Blume, “Significance of bisynchronous spike-waves in patients with temporal lobe spikes,” Epilepsia, vol. 30, no. 2, pp. 143–146, 1989. View at Scopus
  47. P. Ryvlin and P. Kahane, “The hidden causes of surgery-resistant temporal lobe epilepsy: extratemporal or temporal plus?” Current Opinion in Neurology, vol. 18, no. 2, pp. 125–127, 2005. View at Scopus
  48. C. Barba, G. Barbati, L. Minotti, D. Hoffmann, and P. Kahane, “Ictal clinical and scalp-EEG findings differentiating temporal lobe epilepsies from temporal 'plus' epilepsies,” Brain, vol. 130, no. 7, pp. 1957–1967, 2007. View at Publisher · View at Google Scholar · View at Scopus
  49. Y. Aghakhani, A. Rosati, F. Dubeau, A. Olivier, and F. Andermann, “Patients with temporoparietal ictal symptoms and inferomesial EEG do not benefit from anterior temporal resection,” Epilepsia, vol. 45, no. 3, pp. 230–236, 2004. View at Publisher · View at Google Scholar · View at Scopus
  50. M. Guenot and J. Isnard, “Epilepsy and insula,” Neurochirurgie, vol. 54, no. 3, pp. 374–381, 2008. View at Publisher · View at Google Scholar · View at Scopus
  51. P. Ryvlin, “Avoid falling into the depths of the insular trap,” Epileptic Disorders, vol. 8, supplement 2, pp. S37–S56, 2006. View at Scopus
  52. J. Isnard, M. Guénot, M. Sindou, and F. Mauguière, “Clinical manifestations of insular lobe seizures: a stereo- electroencephalographic study,” Epilepsia, vol. 45, no. 9, pp. 1079–1090, 2004. View at Publisher · View at Google Scholar · View at Scopus
  53. K. Ostrowsky, J. Isnard, P. Ryvlin, M. Guénot, C. Fischer, and F. Mauguière, “Functional mapping of the insular cortex: clinical implication in temporal lobe epilepsy,” Epilepsia, vol. 41, no. 6, pp. 681–686, 2000. View at Scopus
  54. C. Munari, J. Talairach, A. Bonis, et al., “Differential diagnosis between temporal and “perisylvian” epilepsy in a surgical perspective,” Acta Neurochirurgica, vol. 30, pp. 97–101, 1980.
  55. J. S. Ebersole and P. B. Wade, “Spike voltage topography identifies two types of frontotemporal epileptic foci,” Neurology, vol. 41, no. 9, pp. 1425–1433, 1991. View at Scopus
  56. C. Baumgartner, G. Lindinger, A. Ebner et al., “Propagation of interictal epileptic activity in temporal lobe epilepsy,” Neurology, vol. 45, no. 1, pp. 118–122, 1995. View at Scopus
  57. R. Krendl, S. Lurger, and C. Baumgartner, “Absolute spike frequency predicts surgical outcome in TLE with unilateral hippocampal atrophy,” Neurology, vol. 71, no. 6, pp. 413–418, 2008. View at Publisher · View at Google Scholar · View at Scopus
  58. M. Avoli, “Do interictal discharges promote or control seizures? Experimental evidence from an in vitro model of epileptiform discharge,” Epilepsia, vol. 42, supplement 3, pp. 2–4, 2001. View at Publisher · View at Google Scholar · View at Scopus
  59. A. Rosati, Y. Aghakhani, A. Bernasconi et al., “Intractable temporal lobe epilepsy with rare spikes is less severe than with frequent spikes,” Neurology, vol. 60, no. 8, pp. 1290–1295, 2003. View at Scopus
  60. O. Stüve, C. B. Dodrill, M. D. Holmes, and J. W. Miller, “The absence of interictal spikes with documented seizures suggests extratemporal epilepsy,” Epilepsia, vol. 42, no. 6, pp. 778–781, 2001. View at Publisher · View at Google Scholar · View at Scopus
  61. F. Saito, Y. Fukushima, S. Kubota, and T. Sato, “Clinico-electroencephalographical significance of small sharp spikes,” Brain and Nerve, vol. 35, no. 3, pp. 221–227, 1983. View at Scopus
  62. J. D. Geyer, E. Bilir, R. E. Faught, R. Kuzniecky, and F. Gilliam, “Significance of interictal temporal lobe delta activity for localization of the primary epileptogenic region,” Neurology, vol. 52, no. 1, pp. 202–205, 1999. View at Scopus
  63. J. Reiher, M. Beaudry, and C. P. Leduc, “Temporal intermittent rhythmic delta activity (TIRDA) in the diagnosis of complex partial epilepsy: sensitivity, specificity and predictive value,” Canadian Journal of Neurological Sciences, vol. 16, no. 4, pp. 398–401, 1989. View at Scopus
  64. N. Dericioglu and S. Saygi, “Ictal scalp EEG findings in patients with mesial temporal lobe epilepsy,” Clinical EEG & Neuroscience, vol. 39, no. 1, pp. 20–27, 2008. View at Publisher · View at Google Scholar
  65. S. Y. Lee, S. K. Lee, C. H. Yun, K. K. Kim, and C. K. Chung, “Clinico-electrical characteristics of lateral temporal lobe epilepsy, anterior and posterior lateral temporal lobe epilepsy,” Journal of Clinical Neurology, vol. 2, no. 2, pp. 118–125, 2006.
  66. J. S. Ebersole and S. V. Pacia, “Localization of temporal lobe foci by ictal EEG patterns,” Epilepsia, vol. 37, no. 4, pp. 386–399, 1996. View at Publisher · View at Google Scholar · View at Scopus
  67. N. Foldvary, N. Lee, G. Thwaites et al., “Clinical and electrographic manifestations of lesional neocortical temporal lobe epilepsy,” Neurology, vol. 49, no. 3, pp. 757–768, 1997. View at Scopus
  68. W. T. Blume and M. Kaibara, “The start-stop-start phenomenon of subdurally recorded seizures,” Electroencephalography and Clinical Neurophysiology, vol. 86, no. 2, pp. 94–99, 1993. View at Scopus
  69. C. Adam, “How do the temporal lobes communicate in medial temporal lobe seizures?” Revue Neurologique, vol. 162, no. 8-9, pp. 813–818, 2006. View at Scopus
  70. J. P. Lieb, R. M. Dasheiff, and J. Engel, “Role of the frontal lobes in the propagation of mesial temporal lobe seizures,” Epilepsia, vol. 32, no. 6, pp. 822–837, 1991. View at Scopus
  71. C. E. Napolitano and M. Orriols, “Two types of remote propagation in mesial temporal epilepsy: analysis with scalp ictal EEG,” Journal of Clinical Neurophysiology, vol. 25, no. 2, pp. 69–76, 2008. View at Publisher · View at Google Scholar · View at Scopus
  72. L. Eross, L. Entz, D. Fabó, et al., “Interhemispheric propagation of seizures in mesial temporal lobe epilepsy,” Ideggyógyászati Szemle, vol. 62, no. 9-10, pp. 319–325, 2009.
  73. P. D. Adelson, M. P. Black, J. R. Madsen et al., “Use of subdural grids and strip electrodes to identify a seizure focus in children,” Pediatric Neurosurgery, vol. 22, no. 4, pp. 174–180, 1995. View at Scopus
  74. J. M. Johnston Jr, F. T. Mangano, J. G. Ojemann, S. P. Tae, E. Trevathan, and M. D. Smyth, “Complications of invasive subdural electrode monitoring at St. Louis Children's Hospital, 1994-2005,” Journal of Neurosurgery, vol. 105, no. 5, pp. 343–347, 2006. View at Scopus
  75. A. M. Siegel, B. C. Jobst, V. M. Thadani et al., “Medically intractable, localization-related epilepsy with normal MRI: presurgical evaluation and surgical outcome in 43 patients,” Epilepsia, vol. 42, no. 7, pp. 883–888, 2001. View at Publisher · View at Google Scholar · View at Scopus
  76. D. A. Steven, Y. M. Andrade-Souza, J. G. Burneo, R. S. McLachlan, and A. G. Parrent, “Insertion of subdural strip electrodes for the investigation of temporal lobe epilepsy. Technical note,” Journal of Neurosurgery, vol. 106, no. 6, pp. 1102–1106, 2007. View at Publisher · View at Google Scholar · View at Scopus
  77. J. J. Van Gompel, F. B. Meyer, W. R. Marsh, K. H. Lee, and G. A. Worrell, “Stereotactic electroencephalography with temporal grid and mesial temporal depth electrode coverage: does technique of depth electrode placement affect outcome?” Journal of Neurosurgery, vol. 113, no. 1, pp. 32–38, 2010. View at Publisher · View at Google Scholar · View at Scopus
  78. D. G. Placantonakis, S. Shariff, F. Lafaille et al., “Bilateral intracranial electrodes for lateralizing intractable epilepsy: efficacy, risk, and outcome,” Neurosurgery, vol. 66, no. 2, pp. 274–283, 2010. View at Publisher · View at Google Scholar · View at Scopus
  79. S. Eisenschenk, R. L. Gilmore, J. E. Cibula, and S. N. Roper, “Lateralization of temporal lobe foci: depth versus subdural electrodes,” Clinical Neurophysiology, vol. 112, no. 5, pp. 836–844, 2001. View at Publisher · View at Google Scholar · View at Scopus
  80. W. T. Blume, G. M. Holloway, and S. Wiebe, “Temporal epileptogenesis: localizing value of scalp and subdural interictal and ictal EEG data,” Epilepsia, vol. 42, no. 4, pp. 508–514, 2001. View at Publisher · View at Google Scholar · View at Scopus
  81. M. R. Sperling and M. J. O'Connor, “Comparison of depth and subdural electrodes in recording temporal lobe seizures,” Neurology, vol. 39, no. 11, pp. 1497–1504, 1989. View at Scopus
  82. J. A. Ogren, A. Bragin, C. L. Wilson et al., “Three-dimensional hippocampal atrophy maps distinguish two common temporal lobe seizure-onset patterns,” Epilepsia, vol. 50, no. 6, pp. 1361–1370, 2009. View at Publisher · View at Google Scholar · View at Scopus
  83. D. King and S. S. Spencer, “Invasive electroencephalography in mesial temporal lobe epilepsy,” Journal of Clinical Neurophysiology, vol. 12, no. 1, pp. 32–45, 1995. View at Scopus
  84. A. L. Velasco, C. L. Wilson, T. L. Babb, and J. Engel Jr, “Functional and anatomic correlates of two frequently observed temporal lobe seizure-onset patterns,” Neural Plasticity, vol. 7, no. 1-2, pp. 49–63, 2000. View at Scopus
  85. A. Bragin, C. L. Wilson, T. Fields, I. Fried, and J. Engel Jr, “Analysis of seizure onset on the basis of wideband EEG recordings,” Epilepsia, vol. 46, supplement 5, pp. 59–63, 2005. View at Scopus
  86. S. A. Lee, D. D. Spencer, and S. S. Spencer, “Intracranial EEG seizure-onset patterns in neocortical epilepsy,” Epilepsia, vol. 41, no. 3, pp. 297–307, 2000. View at Scopus
  87. P. Gloor, V. Salanova, A. Olivier, and L. F. Quesney, “The human dorsal hippocampal commissure. An anatomically identifiable and functional pathway,” Brain, vol. 116, no. 5, pp. 1249–1273, 1993. View at Scopus
  88. F. Spanedda, F. Cendes, and J. Gotman, “Relations between EEG seizure morphology, interhemispheric spread, and mesial temporal atrophy in bitemporal epilepsy,” Epilepsia, vol. 38, no. 12, pp. 1300–1314, 1997. View at Publisher · View at Google Scholar · View at Scopus
  89. S. Mintzer, F. Cendes, J. Soss et al., “Unilateral hippocampal sclerosis with contralateral temporal scalp ictal onset,” Epilepsia, vol. 45, no. 7, pp. 792–802, 2004. View at Publisher · View at Google Scholar · View at Scopus
  90. T. S. Walczak, R. A. Radtke, and D. V. Lewis, “Accuracy and interobserver reliability of scalp ictal EEG,” Neurology, vol. 42, no. 12, pp. 2279–2285, 1992. View at Scopus
  91. M. M. S. Jan, M. Sadler, and S. R. Rahey, “Lateralized postictal EEG delta predicts the side of seizure surgery in temporal lobe epilepsy,” Epilepsia, vol. 42, no. 3, pp. 402–405, 2001. View at Publisher · View at Google Scholar · View at Scopus
  92. M. Kaibara and W. T. Blume, “The postictal electroencephalogram,” Electroencephalography and Clinical Neurophysiology, vol. 70, no. 2, pp. 99–104, 1988. View at Scopus
  93. P. W. Olejniczak, E. Mader, G. Butterbaugh, B. J. Fisch, and M. Carey, “Postictal EEG suppression and hippocampal atrophy in temporal lobe epilepsy,” Journal of Clinical Neurophysiology, vol. 18, no. 1, pp. 2–8, 2001. View at Scopus
  94. J. Janszky, A. Fogarasi, H. Jokeit, R. Schulz, M. Hoppe, and A. Ebner, “Spatiotemporal relationship between seizure activity and interictal spikes in temporal lobe epilepsy,” Epilepsy Research, vol. 47, no. 3, pp. 179–188, 2001. View at Publisher · View at Google Scholar · View at Scopus
  95. J. Engel Jr, A. Bragin, R. Staba, and I. Mody, “High-frequency oscillations: what is normal and what is not?” Epilepsia, vol. 50, no. 4, pp. 598–604, 2009. View at Publisher · View at Google Scholar · View at Scopus
  96. J. Jacobs, P. LeVan, R. Chander, J. Hall, F. Dubeau, and J. Gotman, “Interictal high-frequency oscillations (80–500 Hz) are an indicator of seizure onset areas independent of spikes in the human epileptic brain,” Epilepsia, vol. 49, no. 11, pp. 1893–1907, 2008. View at Publisher · View at Google Scholar · View at Scopus
  97. J. Y. Wu, R. Sankar, J. T. Lerner, J. H. Matsumoto, H. V. Vinters, and G. W. Mathern, “Removing interictal fast ripples on electrocorticography linked with seizure freedom in children,” Neurology, vol. 75, no. 19, pp. 1686–1694, 2010. View at Publisher · View at Google Scholar · View at Scopus
  98. J. Jacobs, M. Zijlmans, R. Zelmann et al., “High-frequency electroencephalographic oscillations correlate with outcome of epilepsy surgery,” Annals of Neurology, vol. 67, no. 2, pp. 209–220, 2010. View at Publisher · View at Google Scholar · View at Scopus