Cyberchondria as an emerging trans-diagnostic digital compulsive syndrome: An updated systematic review and clinical case report

Non peer reviewe

Topiramate plus citalopram in the treatment of Compulsive-Impulsive Sexual Behaviors

Compulsive-Impulsive Sexual Behaviors (C-ISBs) include repetitive sexual acts and compulsive sexual thoughts which occur so frequently and with such intensity that they interfere with sexual intimacy and interpersonal and occupational functioning and whose categorization and effective treatments are still unclear. We report the case of a patient affected by C-ISBs and bipolar disorder of type II who improved dramatically after three months' addition of topiramate to citalopram. Topiramate is a powerful anticonvulsant which has recently been proposed also for the treatment of migraine, bipolar disorder and binge eating disorder. This case-report suggests that topiramate might be beneficial in augmentation with citalopram in patients suffering from C-ISBs, although controlled studies to confirm our findings are needed

Ocular motor abnormalities in achiasmatic mutant Belgian sheepdogs: Unyoked eye movements in a mammal

AbstractWe studied the eye movements of several members of a family of Belgian sheepdogs that includes achiasmatic mutants. Our aim was to identify the types of nystagmus and other ocular motor abnormalities exhibited by the mutants. We also recorded from several unaffected heterozygous carriers of the genetic mutation and from a normal Irish Setter. Mutant dogs exhibited nystagmus waveforms that were occasionally similar to those of humans with congenital nystagmus (CN). Foveating and braking saccades and foveation periods were seen in some waveforms. More common were pendular oscillations of both eyes that were essentially independent in amplitude and phase. At some times there was a pendular nystagmus with a 180 deg phase shift between the movements of the eyes. Similar to the nystagmus, saccades were often unyoked or uniocular. The eye movements of unaffected relatives did not reveal any saccadic instabilities. However, small saccadic intrusions could have been masked by quantization artifacts. Individual dogs from this family provide an animal model of the ocular motor consequences of the disturbed visual input caused by the absence of an optic chiasm and a novel model of CN. Despite any other ocular motor abnormalities present, the CN may be studied in isolation just as in humans it is studied when strabismus and other types of nystagmus are present. Further studies of ocular motor development and function in achiasmatic dogs have the potential to reveal both the organization of the control systems for each extraocular muscle and the role of yoking of the agonist muscles of the two eyes

Prediction of a typhoon using a fine-mesh NWP model.

The ECMWF operational grid point model (with a resolution of 1.875o of latitude and longitude) and its limited area version (with a resolution of approximately 0.47o of latitude and longitude) with boundary values from the global model have been used to study the simulation of the typhoon Tip. The fine-mesh model was capable of simulating the main structural features of the typhoon and predicting a fall in central pressure of 60 mb in 3 days. The structure of the forecast typhoon, with a warm core (maximum potential temperature anomaly 17 K), intense swirling wind (maximum 55 m s-1 at 850 mb) and spiralling precipitation patterns is characteristic of a tropical cyclone. -from Author

Is Cyberchondria a New Transdiagnostic Digital Compulsive Syndrome? A Systematic Review of the Evidence

© 2020 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Background. Cyberchondria (CYB) has been described relatively recently as a behaviour characterized by excessive online searching for medical information that is associated with increasing levels of health anxiety. Although CYB has received some attention from researchers, there is no consensus about many of its aspects. Aims. We describe one of the first reported cases of a treatment-seeking patient with CYB. We review the published literature on the definition of CYB, its assessment, epidemiology, cost and burden, psychological models and mechanisms associated with CYB, relationships between CYB and mental disorders and prevention and treatment strategies. Methods: Systematic review of all peer-reviewed papers published within the PubMed, PsycINFO, and Cochrane Library databases. Results. 61 articles were selected. Nearly all the studies were descriptive and cross-sectional recruiting sample mainly from the general/university student population and collecting self-report data via online surveys. Data on epidemiology, clinical features, course, comorbidity and therapeutic interventions were scarce. CYB showed a self-reported association with health anxiety, hypochondriasis and obsessive-compulsive disorder (OCD) as well as other forms of problematic usage of the internet (PUI) The psychological mechanisms associated with CYB include low self-esteem, anxiety sensitivity, intolerance of uncertainty, pain catastrophizing and certain meta-cognitive beliefs. Conclusion: A working definition of CYB includes excessive online health searches that are compulsive and may serve the purpose of seeking reassurance, whilst leading to a worsening of anxiety or distress and further negative consequences. CYB represents a clinically relevant transdiagnostic compulsive behavioural syndrome, closely related to PUI and usually presenting in association with health anxiety, hypochondriasis and/or OCD. CYB is clearly in need of further study and we identify key areas for future research.Peer reviewe

A Unifying Model-Based Hypothesis for the Diverse Waveforms of Infantile Nystagmus Syndrome

We expanded the original behavioral Ocular Motor System (OMS) model for Infantile Nystagmus Syndrome (INS) by incorporating common types of jerk waveforms within a unifying mechanism. Alexander’s law relationships were used to produce desired INS null positions and sharpness. At various gaze angles, these relationships influenced the IN slow-phase amplitudes differently, thereby mimicking the gaze-angle effects of INS patients. Transitions from pseudopendular with foveating saccades to jerk waveforms required replacing braking saccades with foveating fast phases and adding a resettable neural integrator in the pursuit pre-motor circuitry. The robust simulations of accurate OMS behavior in the presence of diverse INS waveforms demonstrate that they can all be generated by a loss of pursuit-system damping, supporting this hypothetical origin

Comorbidity issues in the pharmacological treatment of pathological gambling: a critical review

BACKGROUND: Pathological Gambling (PG) is an impulse control disorder often comorbid with other psychopathology, particularly bipolar spectrum disorders, attention deficit/hyperactivity disorder, obsessive-compulsive disorder (OCD) and substance abuse. This paper reviews the published literature on the pharmacological management of PG, highlighting how clinical and subclinical comorbid psychopathology influences the choice of pharmacological treatment. METHODS: Using Medline, the authors reviewed relevant articles published on this topic from1995 to 2005, focusing on the best-designed studies for inclusion. RESULTS: Much of the literature on PG-treatment presupposes different theories regarding this disorder. Data suggest the utility of differentiating the pharmacotherapy of pathological gamblers in light of their comorbid profile, specifically assessing for comorbid bipolar, ADHD, OCD, and substance abuse disorders. CONCLUSION: Decisions about pharmacological treatment of PG should take into account current and previous comorbid disorders which influence treatment selection

Wing-tip vortex wandering: comparison of rapid scanning and static hot wire measurements

Wandering is a universal feature of wind-tunnel generated vortices and it consists of abrupt displacements of the vortex core location. Rapid scanning measurements on the tip vortex generated from a NACA 0012 half-wing model were performed in order to achieve data not affected by wandering effects. This measurement technique allows to evaluate the instantaneous vortex centre locations. Wandering was characterized by a bi-variate Gaussian function fitting the probability density function evaluated from experimental vortex centre locations. Wandering is surely attenuated with increasing vortex strength, consequently, this phenomenon can not be considered a self-induced one. For vortices with a moderate strength, wandering might be strongly dependent on flow conditions and measurement locations. It is found that wandering amplitude increases roughly linearly with increasing streamwise distance up to 116% of the vortex core radius, whereas it is fairly invariant with increasing angle of attack. Furthermore, wandering amplitude slightly decreases with increasing free-stream velocity. The wandering smoothing effects on mean velocity profiles were estimated comparing rapid scanning data with static hot wire measurements. In extreme circumstances wandering is responsible to 30% underestimate of the peak tangential velocity and 85% overestimate of the vortex core radius and, consequently, the measured vortex appears more diffuse and weaker than in reality. The shape of the axial velocity profiles corrected for wandering effects exhibit a significant velocity defect in the vortex core up to 20% of the free-stream velocity, and an overshoot at the core border. At high angles of attack a shift between wake flow and jet flow was observed at the vortex core. Wandering leaded to 70% underestimate of the axial velocity deficit and to 30% underestimate of the velocity excess. Finally, secondary vorticity structures were singled out from rapid scanning data in proximity to the main vortex. Furthermore, from a spectral analysis performed on the hot wire measurements, it is found a general increase of the fluctuating energy at low frequencies with approaching the vortex core

The congenital and see-saw nystagmus in the prototypical achiasma of canines: comparison to the human achiasmatic prototype

AbstractWe applied new methods for canine eye-movement recording to the study of achiasmatic mutant Belgian Sheepdogs, documenting their nystagmus waveforms and comparing them to humans with either congenital nystagmus (CN) alone or in conjunction with achiasma. A sling apparatus with head restraints and infrared reflection with either earth- or head-mounted sensors were used. Data were digitized for later evaluation. The horizontal nystagmus (1–6 Hz) was similar to that of human CN. Uniocular and disconjugate nystagmus and saccades were recorded. See-saw nystagmus (SSN), not normally seen with human CN, was present in all mutants (0.5–6 Hz) and in the one human achiasmat studied thus far. This pedigree is an animal model of CN and the SSN caused by achiasma or uniocular decussation. Given the finding of SSN in all mutant dogs and in a human, achiasma may be sufficient for the development of congenital SSN and, in human infants, SSN should alert the clinician to the possibility of either achiasma or uniocular decussation. Finally, the interplay of conjugacy and disconjugacy suggests independent ocular motor control of each eye with variable yoking in the dog