Dark energy models with a slowly rolling cosmological scalar field provide a popular alternative to the standard, time-independent cosmological constant model. We study the simultaneous evolution of background expansion and growth in the scalar field model with the Ratra–Peebles self-interaction potential. We use recent measurements of the linear growth rate and the baryon acoustic oscillation peak positions to constrain the model parameter that describes the steepness of the scalar field potential.

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The combination of interictal and ictal MEG is a valuable tool for identification of the epileptogenic tuber/tubers in presurgical work-up in patients with TS.

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PurposeThe method of temporal lobectomy and parietooccipital disconnection has been applied in the treatment of patients with monolateral widespread cortical lesions and with hand motor function intact. There are no data regarding the use of this method in the treatment of patients with bilateral lesions.Case reportA case history of a 15-year-old female patient with medically refractory epilepsy is presented. Magnetic resonance imaging revealed bilateral periventricular nodular heterotopia associated with cortical dysplasia (CD) in the right temporo-parietal region. The left hemisphere had no signs of CD. Invasive monitoring revealed rhythmic theta–delta activity during the interictal period and fast activity during the ictal onset in the right temporal and parietal regions. The surgery procedure consisted of anterior temporal lobectomy, the removal of the right heterotopy nodus, the dissection of the posterior part of the corpus callosum, and the detachment of the temporo-parieto-occipital complex by dissection behind the sensorimotor cortex. Histological examination of the cortex revealed CD type I. The patient has been seizure-free for 4 years after surgery.ConclusionPartial disconnection procedures may be effective in cases where total hemispherotomy is not indicated in patients with bilateral lesions and a well-lateralized epileptogenic zone localized in the temporo-parieto-occipital region.

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