Emotional Facial Expressions at the Onset of Temporal Lobe Seizures: Observations on Scalp and Intracranial EEG Recordings

1989 ◽  
Vol 43 (3) ◽  
pp. 419-426 ◽  
Author(s):  
Toshio Hiyoshi ◽  
Masakazu Seino ◽  
Tadahiro Mihara ◽  
Kazumi Matsuda ◽  
Takayasu Tottori ◽  
...  
Keyword(s):  
Facial Expressions ◽  
Temporal Lobe ◽  
Emotional Facial Expressions ◽  
Intracranial Eeg ◽  
Temporal Lobe Seizures ◽  
Eeg Recordings

scholarly journals Electroencephalographic Features of Temporal Lobe Epilepsy

2010 ◽  
Vol 37 (4) ◽  
pp. 439-448 ◽  
Author(s):  
Mohammed M. Jan ◽  
Mark Sadler ◽  
Susan R. Rahey
Keyword(s):  
Temporal Lobe Epilepsy ◽  
Surgical Management ◽  
Temporal Lobe ◽  
Seizure Onset ◽  
Resective Surgery ◽  
Accurate Localization ◽  
Epileptiform Discharges ◽  
Ictal Eeg ◽  
Temporal Lobe Seizures ◽  
Eeg Recordings

Electroencephalography (EEG) is an important tool for diagnosing, lateralizing and localizing temporal lobe seizures. In this paper, we review the EEG characteristics of temporal lobe epilepsy (TLE). Several “non-standard” electrodes may be needed to further evaluate the EEG localization, Ictal EEG recording is a major component of preoperative protocols for surgical consideration. Various ictal rhythms have been described including background attenuation, start-stop-start phenomenon, irregular 2-5 Hz lateralized activity, and 5-10 Hz sinusoidal waves or repetitive epileptiform discharges. The postictal EEG can also provide valuable lateralizing information. Postictal delta can be lateralized in 60% of patients with TLE and is concordant with the side of seizure onset in most patients. When patients are being considered for resective surgery, invasive EEG recordings may be needed. Accurate localization of the seizure onset in these patients is required for successful surgical management.

A hierarchical approach for online temporal lobe seizure detection in long-term intracranial EEG recordings

2013 ◽  
Vol 10 (4) ◽  
pp. 045004 ◽  
Author(s):  
Sheng-Fu Liang ◽  
Yi-Chun Chen ◽  
Yu-Lin Wang ◽  
Pin-Tzu Chen ◽  
Chia-Hsiang Yang ◽  
...  
Keyword(s):  
Temporal Lobe ◽  
Seizure Detection ◽  
Hierarchical Approach ◽  
Intracranial Eeg ◽  
Eeg Recordings ◽  
Temporal Lobe Seizure

Intracranial EEG recordings in bi-temporal lobe epilepsy

2007 ◽  
Vol 118 (10) ◽  
pp. e204
Author(s):  
N. Akamatsu ◽  
S. Tsuji ◽  
E. Urasaki
Keyword(s):  
Temporal Lobe Epilepsy ◽  
Temporal Lobe ◽  
Intracranial Eeg ◽  
Eeg Recordings

scholarly journals D.05 SREDA-like temporal EEG seizure pattern in LGI1-antibody mediated encephalitis

2016 ◽  
Vol 43 (S2) ◽  
pp. S14-S14
Author(s):  
C Steriade ◽  
S Mirsattari ◽  
BJ Murray ◽  
R Wennberg
Keyword(s):  
Clinical Features ◽  
Temporal Lobe ◽  
Limbic Encephalitis ◽  
Cognitive Symptoms ◽  
Epileptiform Discharges ◽  
Interictal Epileptiform Discharges ◽  
Eeg Abnormalities ◽  
Eeg Data ◽  
Temporal Lobe Seizures ◽  
Eeg Recordings

Background: Leucine-rich glioma inactived-1 (LGI1) antibodies are associated with limbic encephalitis and distinctive seizure types, which are typically immunotherapy-responsive. While nonspecific EEG abnormalities are commonly seen, specific EEG characteristics are not currently understood to be useful for suspecting the clinical diagnosis. Based on initial observations in two patients, we analyzed the EEG recordings in a larger series of patients and describe a novel ictal pattern that can suggest the diagnosis of LGI1-antibody mediated encephalitis, even in the absence of common clinical features. Methods: Clinical and EEG data were collected in nine patients with LGI1 antibodies. Results: Psychiatric and cognitive symptoms were common, as were tonic seizures associated with EEG electrodecremental events (often with the so-called faciobrachial dystonic semiology). A rarity or absence of interictal epileptiform discharges contrasted with frequent subclinical temporal lobe seizures in some patients, which at times showed characteristics similar to subclinical rhythmic electrographic discharges of adults (SREDA), including sensitivity to hyperventilation. Conclusions: LGI1-antibody mediated encephalitis may be associated with tonic seizures and corresponding electrodecremental events, as well as an unusual SREDA-like pattern of frequent subclinical temporal lobe seizures, which may be triggered by hyperventilation, all in the setting of rare interictal epileptiform discharges.

Fentanyl-induced electrocorticographic seizures in patients with complex partial epilepsy

1992 ◽  
Vol 77 (2) ◽  
pp. 201-208 ◽  
Author(s):  
René Tempelhoff ◽  
Paul A. Modica ◽  
Kerry L. Bernardo ◽  
Isaac Edwards
Keyword(s):  
Temporal Lobe ◽  
Seizure Activity ◽  
Epileptiform Activity ◽  
Temporal Lobectomy ◽  
Electrode Arrays ◽  
Complex Partial Seizures ◽  
Content Type ◽  
Temporal Lobe Seizures ◽  
Eeg Recordings ◽  
The Right

✓ Although electrical seizure activity in response to opioids such as fentanyl has been well described in animals, scalp electroencephalographic (EEG) recordings have failed to demonstrate epileptiform activity following narcotic administration in humans. The purpose of this study was to determine whether fentanyl is capable of evoking electrical seizure activity in patients with complex partial (temporal lobe) seizures. Nine patients were studied in whom recording electrode arrays had been placed in the bitemporal epidural space several days earlier to determine which temporal lobe gave rise to their seizures. The symptomatic temporal lobe was localized by correlating clinical and electrical seizure activity obtained during continuous simultaneous videotape and epidural EEG monitoring. In each patient, clinical seizures and electrical seizure activity were consistently demonstrated to arise unilaterally from one temporal lobe (four on the right, five on the left). During fentanyl induction of anesthesia in preparation for secondary craniotomy for anterior temporal lobectomy, eight of the nine patients exhibited electrical seizure activity at fentanyl doses ranging from 17.7 to 35.71 µg · kg−1 (mean 25.75 µg · kg−1). More importantly, four of these eight seizures occurred initially in the “healthy” temporal lobe contralateral to the surgically resected lobe from which the clinical seizures had been shown to arise. These findings indicate that, in patients with complex partial seizures, moderate doses of fentanyl can evoke electrical seizure activity. The results of this study could have important implications for neurosurgical centers where electrocorticography is used during surgery for the purpose of determining the extent of the resection.

scholarly journals Ictal Vocalization and Verbalization in Temporal Lobe Seizures-An Clinical and Intracranial EEG Analysis.

1993 ◽  
Vol 11 (2) ◽  
pp. 121-130 ◽  
Author(s):  
Yushi Inoue ◽  
Tadahiro Mihara ◽  
Kazumi Matsuda ◽  
Takayasu Tottori ◽  
Yutaka Watanabe ◽  
...  
Keyword(s):  
Temporal Lobe ◽  
Eeg Analysis ◽  
Intracranial Eeg ◽  
Temporal Lobe Seizures

scholarly journals Preoperative Electroencephalographic Investigation in Temporal Lobe Epilepsy: Extracranial and Intracranial Recordings

1991 ◽  
Vol 18 (S4) ◽  
pp. 554-558 ◽  
Author(s):  
Pierre Gloor
Keyword(s):  
Temporal Lobe ◽  
Video Monitoring ◽  
Epileptiform Discharges ◽  
Interictal Epileptiform Discharges ◽  
Eeg Data ◽  
Temporal Lobe Seizures ◽  
Eeg Recordings ◽  
Intracranial Recordings ◽  
Eeg Features

ABSTRACT:Preoperative EEG investigations of patients with temporal lobe seizures include extracranial interictal and ictal recordings during wakefulness and sleep, including long-term EEG and video-monitoring. Interictal epileptiform discharges when evaluated conservatively and in conjunction with other EEG and non-EEG localizing information, provide valuable guidance for the identification of the area to be resected, as do ictal recordings. When extracranial EEG features in conjunction with non-EEG data provide conflicting localizing information, intracranial recordings with stereotaxically implanted depth and epidural electrodes are used. Intracranial recordings must be designed to avoid biasing the exploration strategy in favor of one's preferred localizing hypothesis. Patients with evidence for bitemporal epileptogenic dysfunction in extracranial EEG recordings are suitable candidates for intracranial recordings. The majority of the patients explored in this manner show that all or more than 80% of their seizures arise from one temporal lobe. Excision of that lobe yields satisfactory results in a fair proportion of these patients. The number of satisfactory outcomes is, however, still somewhat less than in patients with unilateral temporal foci in extracranial EEG recordings.

scholarly journals Impairment of emotional expression detection after unilateral medial temporal structure resection

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wataru Sato ◽  
Naotaka Usui ◽  
Reiko Sawada ◽  
Akihiko Kondo ◽  
Motomi Toichi ◽  
...  
Keyword(s):  
Visual Field ◽  
Facial Expressions ◽  
Temporal Lobe ◽  
Medial Temporal Lobe ◽  
Temporal Structure ◽  
Reaction Times ◽  
Right Visual Field ◽  
Emotional Facial Expressions ◽  
Number Of Patients ◽  
Stimulation Of

AbstractDetecting emotional facial expressions is an initial and indispensable component of face-to-face communication. Neuropsychological studies on the neural substrates of this process have shown that bilateral amygdala lesions impaired the detection of emotional facial expressions. However, the findings were inconsistent, possibly due to the limited number of patients examined. Furthermore, whether this processing is based on emotional or visual factors of facial expressions remains unknown. To investigate this issue, we tested a group of patients (n = 23) with unilateral resection of medial temporal lobe structures, including the amygdala, and compared their performance under resected- and intact-hemisphere stimulation conditions. The participants were asked to detect normal facial expressions of anger and happiness, and artificially created anti-expressions, among a crowd with neutral expressions. Reaction times for the detection of normal expressions versus anti-expressions were shorter when the target faces were presented to the visual field contralateral to the intact hemisphere (i.e., stimulation of the intact hemisphere; e.g., right visual field for patients with right hemispheric resection) compared with the visual field contralateral to the resected hemisphere (i.e., stimulation of the resected hemisphere). Our findings imply that the medial temporal lobe structures, including the amygdala, play an essential role in the detection of emotional facial expressions, according to the emotional significance of the expressions.

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