No abstract available.
Occipital Lobe*

No abstract available.
Occipital Lobe*

No abstract available.
Epilepsy* ; Occipital Lobe* ; Rabeprazole*

A case of 'primative glioma' which involved left parietal and occipital lobes of a child is reported with detailed views on the clinical and pathologic findings.
Child ; Humans ; Occipital Lobe ; Rabeprazole

Cortical blindness means visual loss caused by bilateral destruction of visual cortex. Cortical blindness can develop after cerebral angiography due to hypertonic contrast medium which open the blood-brain barrier and then alternate the function of visual cortex transiently. About 30 minutes after injection of contrast medium (Ultravist 370(R)) during cerebral angiography, the patient complained of decrease of visual acuity. And 3 hours later, evaluation revealed that she could not see even the light. But her vision began to improve after 19 hours and recovered completely after 7 days. MRI taken at 12 hours after cerebral angiography showed high signal intensities in the both occipital lobes. But in repeated MRI study, which was taken after 3 days, previously noted high densities were completely disappeared. So we diagnosed this case as cortical blindness caused by hypertonic contrast medium.
Blindness, Cortical* ; Blood-Brain Barrier ; Cerebral Angiography* ; Humans ; Magnetic Resonance Imaging ; Occipital Lobe ; Visual Acuity ; Visual Cortex

Cortical blindness means visual loss caused by bilateral destruction of visual cortex. Cortical blindness can develop after cerebral angiography due to hypertonic contrast medium which open the blood-brain barrier and then alternate the function of visual cortex transiently. About 30 minutes after injection of contrast medium (Ultravist 370(R)) during cerebral angiography, the patient complained of decrease of visual acuity. And 3 hours later, evaluation revealed that she could not see even the light. But her vision began to improve after 19 hours and recovered completely after 7 days. MRI taken at 12 hours after cerebral angiography showed high signal intensities in the both occipital lobes. But in repeated MRI study, which was taken after 3 days, previously noted high densities were completely disappeared. So we diagnosed this case as cortical blindness caused by hypertonic contrast medium.
Blindness, Cortical* ; Blood-Brain Barrier ; Cerebral Angiography* ; Humans ; Magnetic Resonance Imaging ; Occipital Lobe ; Visual Acuity ; Visual Cortex

No abstract available.
Hemangioma, Cavernous* ; Occipital Lobe* ; Status Epilepticus*

We used quantitative electroencephalography (EEG) spectral analysis to compare activity in the bilateral frontal, central, and occipital areas in nine patients with schizophrenia and ten healthy control subjects during standard nocturnal polysomnography. Patients with schizophrenia had longer sleep latency than controls. In N2 sleep, the patients had significantly lower 0.5–1 Hz power and higher theta power in the left frontal region, and higher beta power in the left occipital region than did control subjects. In N3 sleep, the patients with schizophrenia had significantly higher alpha power in the left occipital region than did controls. These findings show distinctive EEG sleep patterns in patients with schizophrenia, which may reflect brain dysfunction or medication effects.
Brain ; Electroencephalography* ; Humans ; Occipital Lobe ; Polysomnography ; Schizophrenia*

BACKGROUND: The aim of the study was to examine the characteristics of alpha wave peak frequency, power, and coherence in patients with schizophrenia. METHODS: Thirty-one patients with schizophrenia and age- and sex-matched subjects with no psychopathology were enrolled. All study participants underwent quantitative electroencephalography (QEEG). Alpha-related values, including peak frequency, power, and coherence, were evaluated. RESULTS: Alpha peak frequency on the Oz area was slower in the schizophrenia group than that in the control group. However, no differences in absolute or relative power were observed between the two groups. Significant reductions in absolute and relative coherence were observed at the C3–C4 and T3–T4 nodes in the patients with schizophrenia. Relative coherence was reduced at the P3–P4 nodes. CONCLUSION: This study focused on alpha variables detected in QEEG as intrinsic values to distinguish schizophrenia from a healthy control. The results suggest decreased alpha peak frequency of the occipital lobe and decreased coherence between the two hemispheres in patients with schizophrenia. A further study could elucidate the causal relationship and biological meaning of the variations in alpha waves in patients with schizophrenia.
Electroencephalography* ; Humans ; Occipital Lobe ; Psychopathology ; Schizophrenia*

Epilepsy is a neurological disease with disordered brain network connectivity. It is important to analyze the brain network mechanism of epileptic seizure from the perspective of directed functional connectivity. In this paper, causal brain networks were constructed for different sub-bands of epileptic electroencephalogram (EEG) signals in interictal, preictal and ictal phases by directional transfer function method, and the information transmission pathway and dynamic change process of brain network under different conditions were analyzed. Finally, the dynamic changes of characteristic attributes of brain networks with different rhythms were analyzed. The results show that the topology of brain network changes from stochastic network to rule network during the three stage and the node connections of the whole brain network show a trend of gradual decline. The number of pathway connections between internal nodes of frontal, temporal and occipital regions increase. There are a lot of hub nodes with information outflow in the lesion region. The global efficiency in ictal stage of α, β and γ waves are significantly higher than in the interictal and the preictal stage. The clustering coefficients in preictal stage are higher than in the ictal stage and the clustering coefficients in ictal stage are higher than in the interictal stage. The clustering coefficients of frontal, temporal and parietal lobes are significantly increased. The results of this study indicate that the topological structure and characteristic properties of epileptic causal brain network can reflect the dynamic process of epileptic seizures. In the future, this study has important research value in the localization of epileptic focus and prediction of epileptic seizure.
Humans ; Epilepsy ; Brain ; Seizures ; Electroencephalography ; Occipital Lobe