The Born approximation is based on the assumption of small slowness perturbation. We investigate the limits of the Born approximation when applied to wave-equation migration velocity analysis and propose two new schemes which allow for larger slowness anomalies, while improving accuracy and increasing stability. The new schemes are based on linearizations of exponential functions using bilinear...

Obsessional slowness is regarded as an uncommon but severely disabling variant of obsessive-compulsive disorder. This paper examines the psychopathology, classification, pathophysiology and treatment of obsessional slowness. It argues that primary obsessional slowness does not require classification as a separate syndrome because it can be found to be secondary to recognised phenomena of obsess...

Focusing on the cultural significations and artistic capacities of naqqali, this article examines the comparative workings of this Iranian popular genre in Hossein Jamali’s Hamlet: The Retribution Affair. Jamali’s adaptation is worth considering since it narrates the whole events and characters of Shakespeare’s Hamlet, a classic text of English literature, through naqqali, a classic Persian gen...

Slow population activities (SPAs) exist in the brain and have frequencies below ~5 Hz. Despite SPAs being prominent in several cortical areas and serving many putative functions, their mechanisms are not well understood. We studied a specific type of in vitro GABAergic, inhibition-based SPA exhibited by C57BL/6 murine hippocampus. We used a multipronged approach consisting of experiment, simula...

Obsessive slowness is described to be a syndrome of extreme slowness in ways various tasks are performed. Its existence as an independent syndrome is challenged by authors, who regard it to be a part of obsessive compulsive disorder. Behavioural techniques of prompting, pacing and shaping are recommended for treatment of this condition. We describe here a case of a 21 year old male patient who ...

Abstract Small‐scale mid‐mantle heterogeneities (<100 km) are revealed by various short‐period seismic waves with different sampling paths. Here, using dense stations in China, we present the observations of a new phase that arrives as PP precursor. This arrival represents P‐wave scattered at PdpP (“d” indicates depth heterogeneity) and appears two forms: (a) wave train increasing slowness f...

[1] We introduce a coherence measure for seismic signal enhancement through incoherent noise attenuation. Our processing tool is designed for densely spaced arrays and identifies signals by their coherent appearance. The approach is based on the determination of the lateral phase coherence as function of distance, time, frequency, and slowness. The coherence is derived from the local phases of ...