Rigid Behavior Research Articles

EXPERIMENTAL THERMOCHEMICAL, PHYSICAL AND MECHANICAL CHARACTERIZATION OF THE UNIAXIAL COMPRESSION OF PVC TUBES LOADED WITH 12.54% AND 51.02% OF DURA PALM KERNEL SHELL POWDER

We have carried out here a chemical, thermal, physical characterization and a study of the mechanical behavior to the tubular compression of the PVC tubes loaded with 0%, 12.54% and 51.02% of the dura palm kernel shell powder obtained by extrusion and give an approach on its use. To achieve these objectives, we took the unloaded PVC tubes then the PVC tubes loaded with 12.54% and 51. 02% of the extruded shell powder, which we characterized: thermally by ATG/DSC with a LENSEI apparatus to obtain TG and DSC, chemically by Fourier transform infrared analysis with a Thermo Scientific Nicolet iS5 IR spectrometer to obtain FTIR, physically with standard equipment according to standards to obtain density, then mechanically by uniaxial tubular compression with a machine of compression-flexion of mark controlab to obtain the bearing capacities, the resistances and the behavior of the tubes to the uniaxial tubular compression. We obtained: at elaborated, tubes of diameter (D=90mm and d=82mm) of color light gray, dark gray, dark black respectively for the PVC tubes unloaded and loaded to 12.54% and 51.02%. DSC thermograms of the tubes showed glass transition, combustion temperature, calcination temperature and ash onset temperature and TG thermograms, mass change on dehydration, dehydrochlorination, condensation and residual calcination sensitive. FTIR showed particular groupings of the presence of: lignin from palm kernel shells and chlorine from PVC in the tubes. The density of the tubes gave 1.42 g/cm3 for the unloaded PVC tubes, 1.38 g/cm3 for the loaded PVC tubes at 12.54% and 1.23g/cm3 for 51.02% justifying the low density of the hull powder in the tubes. The bearing capacity as well as the mechanical strength, the shortening and the compression behaviour of the tube allowed to say that the unloaded PVC tubes and those loaded at 12.54% have a tenacious and ductile behaviour while those loaded at 51.02% have a rigid, brittle and fragile behaviour. These results show that the palm kernel shell powders used as loads influence in a sensitive way the physical, thermal, chemical and mechanical properties allowing several fields like aeronautics, automobile, building, toys for entertainment and laboratory materials to be interested in its production.

Joint Hypermobility and Clinical Correlates in a Group of Patients With Eating Disorders.

Background: The ability to move joints beyond the normal range of motion is called Joint Hypermobility (JHM). JHM has been associated with a plethora of physical problems and is a frequent sign of hereditary disorders of connective tissue. Neuropsychiatric conditions such as eating disorders (ED) have also been related to JHM. However, little is known about the clinical profile of people with ED and JHM. The aim of this study was to explore JHM in patients with ED and to compare the clinical characteristics of hypermobile ED patients with non-hypermobile ED patients.Method: Fifty-three outpatients diagnosed with ED were assessed using the Beighton score for JHM, the Eating Disorders Inventory 2, the Eating Disorder Examination, and the Detail and Flexibility Questionnaire. Information relating to patients' psychiatric and somatic comorbidities/symptoms was also collected.Results: Using the traditional Beighton score's cutoff of ≥4, 41.5% of the sample presented with JHM. Our results indicate that compared with non-hypermobile ED patients, those with JHM are significantly younger, suffer at a greater extent from joint pain and easy bruising, have a shorter duration of the ED, and have lower scores for cognitive rigidity. In addition, for those with anorexia nervosa, the restricting subtype represents a significantly lower proportion of hypermobile ED patients compared to non-hypermobile ED patients. Multivariate analyses showed that cognitive rigidity, age, and duration of the ED could predict the JHM status in this sample.Conclusion: These results suggest that JHM is frequent in patients with ED and is accompanied by signs of tissue fragility. Patients with ED and JHM seem to present a specific profile characterized by less cognitive rigidity and restricting behavior in the case of anorexia nervosa. Further research is needed in order to confirm these results.

Development of advanced methods to characterise the fracture behaviour of flexible bonded joints: An overview

In some cases, the scope of bonded joint characterisation methods applied in laboratory may not be aligned with the bonded joints used in industry. Experimental results produce uncertainty and cause the bonded joints to be replaced by mechanical joints. Experimental procedures evidence a strong dependence on specimen dimensions, type of adhesive, ageing and crack measurement. They are suitable for bonded joints with thin adhesive layers and rigid behaviour while bonded joints in industrial applications have many different geometries and types of adhesive. Moreover, they must withstand external loads and environmental conditions simultaneously, while cracks may not be visible. The present work summarises the methodologies developed to overcome the limitations of current experimental procedures. An analytical method is developed to evaluate the fracture toughness of bonded joints with any width-to-thickness configurations. It is also demonstrated that external loads accelerate the degradation of bonded joints exposed to environmental conditions. Consequently, a new durability test has been developed for bonded joints that considers sustained loads during environmental exposure. Finally, it is demonstrated that the Acoustic Emissions technique is suitable for crack growth monitoring in bonded joints, providing a reliable alternative to locate the cracks when they are not visible.

Curved bridges live load bending moment distribution using straight and curved girders

abstract: The present study focuses on comparative parametric analysis of curved precast concrete bridges using straight and curved I-girders. The live load bending moment distribution for girders was studied using the bridge curvature and its relationship with the results obtained for a straight bridge. FEM 3D models were developed with restrictions on the transverse live load positions and with two different load models types: HL-93 (AASHTO) and TB-450 (NBR 7188, 2013). The parametric analysis results were calculated using the Modification Factor (MF) and the Bending Moment Distribution Factor (BMDF), calculated from the structural analysis of each model at the midspan. Globally, an increase was found in the total bending moment for the curved bridge models in relation to the straight bridge. In the examples herein studied, the larger the bending radius, the larger the maximal bending moment in the bridge center. For the external girders, the MF increases with the increase of the L/R. For the internal ones, the MF decreases with the increase of the L/R. In addition, the occurrence of “Load Shift” was different from the rigid body behavior, for there was demonstrated a different bending moment variation between external girder (G1) in relation to its adjacent (G2). Therefore, the structural behavior of straight (SG) and curved girders (CG) was analyzed, revealing that, in the SG, a significant gap occurred in the BMDF between G1 and G2 girders for all curvatures. For L/R = 0.6, it caused a difference of 17.8% in the BMDF between the G1 and G2 girders, while on the curved girders, a difference of only 6.6% was found.

Аутоподобный тип адаптации, феноменология процесса развития и адаптации человека, имеющего расстройства аутистического спектра

Autism spectrum disorder (ASD) is one of the most common developmental disorders. It includes impaired socialization and communication, stereotypical behaviors, cognitive abnormalities, and a wide range of sensory features. While most experts now agree that the social impairments seen in ASD are caused by cognitive deficits, including deficits in cognitive processing of sensory information, there is yet no generally accepted theory to explain the causes of ASD and the nature of the relationship between the deficits in the sensory, cognitive, and social domains. This paper addresses the advances in understanding the sensory-cognitive traits defining an autistic perception, particularly at early age, and presents a model of autistic adaptation (AA) suggesting that social deficits, rigid behavioral patterns, and self-stimulation can be conceived as a consequence of a suboptimal adaptation strategy brought forth by a need to cope with sensory hypersensitivity and to make the outside world a less chaotic and more predictable place. As a result of this adaptation, most children with ASD at an early age (up to 1.5-2 years) form a system of protection against external sensory stimuli perceived as excessively intense at a subjective level; this protection system includes behavioral responses aimed at limiting incoming sensory information and increasing predictability of sensations received by actively searching for the more uniform and predictable external stimuli, avoiding social interaction, narrowing activity range, and following rigid behavior patterns. Special attention is paid to a well-documented tendency of children with ASD to use peripheral vision instead of central vision (lateral glances) and to refrain from behaviors aimed on integration of auditory and visual information; these sensory behaviors, though helpful in preventing sensory overflow, lead to an even more fragmented perception of an outside world characteristic for an autistic personality. Sensory self-stimulation (stimming) is also perceived as a specific adaptive mechanism that provides a child with ASD with predictable and controllable sensations and is aimed at reducing anxiety associated with the intense and unpredictable flow of external sensory information. Further attempts to better understand the specific behaviors and perceptual traits associated with autistic adaptation may lead to development of more effective intervention programs for children with ASD. A broad range of sensory integration therapies are sought that aim to establish new behavioral responses and perception strategies helping to integrate the sensory information, cope with sensory overflow, and enable us to explore the world in a more positive and efficient way.

Substitutive Press-Bolster and Press-Ram Models for the Virtual Estimation of Stamping-Tool Cambering.

Today’s stamping simulations are realized by ignoring the elastic deformation of the press and tooling system through the assumption of a rigid behavior and a perfect press stroke. However, in reality, the press and tool components deform elastically and are one of the major error sources for the final adjustment and blue-spotting of the dies. In order to tackle this issue, a new approach is proposed in this study that substitutes the press stiffness by means of a substitutive model composed of cost-effective shell and beam elements. The substitute model was calibrated using full-scale measurements, in which a 20,000 kN trial press was experimentally characterized by measuring its deformation under static loads. To examine the robustness of the substitute model, a medium-size tool and a large-size tool were simulated together with the substitutive model. To this end, a B-pillar tool was re-machined based on the substitute-model results and a new cambering procedure was proposed and validated throughout the blue-painting procedure. The newly developed substitute model was able to replicate the global stiffness of the press with a high accuracy and affordable calculation time. The implementation of the findings can aid toolmakers in eliminating most of the reworking and home-line trials.

Inter-Element Crack Propagation with High-Order Stress Equilibrium Element

The present contribution proposes a formulation based on the use of hybrid equilibrium elements (HEEs), for the analysis of inter-element delamination and fracture propagation problems. HEEs are defined in terms of quadratic stress fields, which strongly verify both the homogeneous and inter-element equilibrium equations and they are employed with interfaces, initially exhibiting rigid behavior, embedded at the elements’ sides. The interface model is formulated in terms of the same degrees of freedom of the HEE, without any additional burden. The cohesive zone model (CZM) of the extrinsic interface is rigorously developed in the damage mechanics framework, with perfect adhesion at the pre-failure condition and with linear softening at the post-failure regime. After a brief review, the formulation is computationally tested by simulating the behavior of a double-cantilever-beam with diagonal loads; the obtained numerical results confirm the accuracy and potential of the method.

Social attention in anorexia nervosa and autism spectrum disorder: Role of social motivation.

Research suggests a relationship between anorexia nervosa and autism spectrum disorder. The aim of the current study was to examine social attention in anorexia nervosa and autism spectrum disorder compared with age- and sex-matched typically developing groups, and to examine whether lowered social motivation could explain reductions in social attention across the two disorders. Participants’ eye movements were tracked while watching a dynamic social scene. The proportion of fixation duration to faces, bodies and non-social areas of interest were compared across groups. Participants with autism spectrum disorder looked at faces significantly less often than controls, however, there were no differences between anorexia nervosa and controls in attention to faces. Typically developing -normed z-scores indicated that attention to faces showed the greatest deviation from normative data compared with body or non-social areas of interest in both autism spectrum disorder and anorexia nervosa, however, differences were larger in autism spectrum disorder than in anorexia nervosa. Social motivation scores did not predict attention to faces in either autism spectrum disorder or anorexia nervosa. Our results do not support the hypothesis that differences in social motivation underlie reduced social attention in both anorexia nervosa and autism spectrum disorder.Lay abstractResearch suggests a relationship between autism and anorexia nervosa. For example, rigid and inflexible behaviour, a preference for routine and social difficulties are seen in both conditions. In this study, we examined whether people with anorexia and people with autism show similarities in social attention (where they look while engaging in social interactions or watching a scene with people interacting). This could help us understand why people with anorexia and autism experience difficulties in social situations. Participants with either anorexia or autism, as well as participants with no mental health problems watched a video of a social scene while we recorded which parts of the scene they looked at with an eye-tracker. Participants also completed questionnaires to assess characteristics of autism. We found that autistic participants looked at faces less than typically developing participants. However, participants with anorexia did not show a similar reduction in attention to faces, contrary to our predictions. Autistic features were not related to attention in either group. The results suggest that autistic people may miss important social cues (like facial expressions), potentially contributing to social difficulties. However, this mechanism does not appear explain social difficulties in people with anorexia.

Energy Absorption Capacity Of Rat-Trap Bond Masonry Under Base Excitation

Brick masonry does not exhibit much capacity to resist lateral loads and hence the masonry suffers heavy damage during earthquakes, which impart lateral loads to structures. In the Bhuj earthquake of Jan 26, 2001, that occurred in majority of masonry structures failed because they were built with un-reinforced brick masonry. The EBC code of practice for brick masonry, suggests the use of lintel band and roof band that introduce a rigid box-type behavior which will help the structure to improve its performance against seismic loads. But there are no Codal provisions for use of Rat-Trap bond masonry which has been found to possess good seismic resistance characteristics. Rat-Trap bond system consists of an array of headers and stretchers with bricks laid vertically on the edge to form a cavity within a set of two headers and two stretchers. In this investigation, an attempt has been made to study the behavior of un-reinforced Rat-Trap bond masonry of two categories viz., (i) with roof slab, and (ii) without roof slab. Shock-table tests on one-third scale masonry building models ( with and without roof slabs ) were carried out to study the behavior. The peak accelerations were recorded for each shock. The scaled bricks were obtained by cutting locally available bricks using special tools. The size of the masonry models was 2m x 1m x 1m. The amount of energy imparted during each shock was measured before total collapse both for Rat-Trap bond masonry models with and without roof slabs. The results of the tests revealed that the roof weight plays an important role in the design of Rat-Trap masonry systems subject to seismic loads.

Overlapping Neural Circuitry Links Cognitive Flexibility and Activity-Based Anorexia

Anorexia nervosa (AN) is a complex illness that is primarily characterized by abnormal restrictive feeding behavior and a dangerously low body mass index and that primarily affects young women and girls (1). AN is strongly associated with several cognitive traits that predate the onset of illness, including impaired cognitive flexibility, which is defined as the inability to modify cognitive strategies and behavior to adapt to changing environmental demands. In AN, perseverative thinking and rigid behavior, including preoccupations with food, body shape, and compulsive exercise in the pursuit of thinness, are hallmarks of cognitive inflexibility.

Impaired remapping of social relationships in older adults

Social relationships are a central aspect of our everyday life, yet our ability to change established social relationships is an under-investigated topic. Here, we use the concept of cognitive mapping to investigate the plasticity of social relationships in younger and older adults. We describe social relationships within a ‘social space’, defined as a two-dimensional grid composed of the axis ‘power’ and ‘affiliation’, and investigate it using a 3D virtual environment with interacting avatars. We show that participants remap dimensions in ‘social space’ when avatars show conflicting behavior compared to consistent behavior and that, while older adults show similar updating behavior than younger adults, they show a distinct reduction in remapping social space. Our data provide first evidence that older adults show more rigid social behavior when avatars change their behavior in the dimensions of power and affiliation, which may explain age-related social behavior differences in everyday life.

Rigidity Hierarchy in Random Point Fields: Random Polynomials and Determinantal Processes

In certain point processes, the configuration of points outside a bounded domain determines, with probability 1, certain statistical features of the points within the domain. This notion, called rigidity, was introduced in Ghosh and Peres (Duke Math J 166(10):1789–1858, 2017). In this paper, rigidity and the related notion of tolerance are examined systematically and point processes with rigidity of various degrees are introduced. Natural classes of point processes such as determinantal point processes, zero sets of Gaussian entire functions and perturbed lattices are examined from the point of view of rigidity, and general conditions are provided for them to exhibit specified nature of spatially rigid behaviour. In particular, we examine the rigidity of determinantal point processes in terms of their kernel, and demonstrate that a necessary condition for determinantal processes to exhibit rigidity is that their kernel must be a projection. We introduce a one parameter family of point processes which exhibit arbitrarily high levels of rigidity (depending on the choice of parameter value), answering a natural question on point processes with higher levels of rigidity (beyond the known examples of rigidity of local mass and center of mass). Our one parameter family is also related to a natural extension of the standard planar Gaussian analytic function process and their zero sets.

An analytical model to determine the impact force of drone strikes

In addition to the well-known threats of bird and hail strikes, small unmanned aerial vehicles (sUAV) pose a new threat to manned aviation. Determining the severity of collisions between sUAVs and aircraft structures is essential for the safe use and integration of drones in airspace. A generic analytical calculation model needs to be developed to supplement the existing test and simulation data. This paper presents an analytic model for drone collisions with perpendicular and inclined targets. The targets have a rigid or elastic material behavior. The aircraft impact model, which is used for the design of nuclear reactor structures, is transferred and adjusted for sUAV impacts to calculate the impact force. A mass- and a burst load distribution are needed as input parameters. Both distributions are determined for an sUAV design depending on the flight direction. Compared to previous calculations, the new approach is to consider a moving target structure, which produces more realistic results. We compare the calculation results with simulation data from sUAV collisions with a commercial airliner windshield from the literature. The calculations show plausible results and a good agreement with literature data. Subsequently, the influence of the input parameters on the impact force is investigated. We see that spring stiffness, target mass, burst load distribution and damping have minor influence on the overall impact force. The impact velocity, mass distribution and flight orientation on the other hand have a major influence on the impact force. Further tests are needed to validate the impact model.

Economic Policy Uncertainty, National Culture, and Corporate Debt Financing

Financial innovation vis-à-vis economic policy uncertainty (EPU) without due regards being given to debt financing. This paper fills this gap and unveils the dynamic role of national culture in defining debt financing via EPU. We use a sample of 3831 non-financial firms of Asian economies and employ the System Generalized Method of Moments to estimate the regression coefficients. Our findings reveal an inverse relationship between the EPU and debt financing, which suggests that debt finance mitigation strategies are successfully executed in the region. The potential reasons for this include the policies by businesses to reduce business activities and avoid the unfavorable rising financing cost through EPU. On the supply side, the rising EPU induces the banks to accelerate their interest rate due to increased default risk. Similarly, we observe that high uncertainty avoidance (UND) has a negative and significant link with debt financing due to an unpleasant behavior of corporate managers towards debt when they have an alternate source of financing instruments instead of accepting long-term obligations. However, we find that the UND and EPU interaction has a significantly positive impact on debt financing due to the rigid behavior of managers, which forces them to consider cultural traits and converts their risk-averse attitude into risk-friendly behavior. This implies that corporate managers should reflect the sensitivity of the national culture while considering debt financing.

Damping of vibration-isolated structures: A review

Vibration presents a major challenge to advanced experiments in physics and life sciences, as well as to precise manufacturing processes. A vibration-isolated platform had become an indispensable element of precision experimental and manufacturing systems. Ideally, the platform should behave as an absolutely rigid body; unfortunately, absolutely rigid bodies do not exist: any structure deviates from the rigid behavior at its resonance frequencies. Resonance vibrations of the platform carrying precision optomechanical or acoustical equipment can be excited by acoustical inputs, residual vibrations coming from the floor through vibration isolators, and atmospheric turbulence. These vibrations must be mitigated by dissipation of mechanical energy, or damping. This paper summarizes current methods and achievements in active and passive damping of optical tables and breadboards, applicable also to other types of structures. Dynamic response of an isolated platform is analyzed. Physical principles of active damping systems, multiple tuned dynamic absorbers, and elastomeric constrained-layer damping links are presented; various designs of damping devices are considered, and their operation illustrated by experimental results; advantages and shortcomings of each method are discussed.

The Prophet’s Da’wah to Jews & their Opposition (A research-based study on its causes and reasons)

Before the migration of the Holy Prophet ﷺ, Madinah was inhabited by Jews. They possessed some of the most fertile lands in Madinah and carried on several crafts, especially as goldsmiths. The Jews acted as moneylenders to the Arabs. They had many strongholds in and around Madinah. Thus, the Jews had a firm position in Madinah. The Holy Prophet ﷺ, irrespective of Jewish attitude, tried his level best to maintain a friendly relationship with the Jews. They were granted political, social and religious freedom. However, the Jews became increasingly hostile to the Muslims despite these rights and concessions as they wanted to dominate Arabia politically and religiously. Thus, they expressed their bitterness and hostility in many ways, which worsened their relations with the Muslims. This research is aimed at highlighting the history, socio-political status and conspiracies of Jews. The researcher presented detailed accounts on the opponent and rigid behaviour of Jews along with their character. The distinct element of the article is the references and a discourse on the Jewish tribes who opposed Islam openly. The researcher also worked out the causes why a call to Islam for Jews was indispensable. Likewise, he also mentioned the reasons and the causes of opposition from the then Jews. Jews, out of jealousy did not accept Islam. However, they kept demanding multiple things as previous. The article also mentions them. This piece of research is highly recommended for the young generation who are unaware of the history and attitude of the Jews that continued since the times of the Prophets.

Religious Tolerance and Coexistence: Pluralist Dimensions in Ibn-e-Safi’s Life and Writings

Ibn-e-Safi is one of the prominent literary figures of South Asia and has a special place among the writers of mystery fiction in modern Urdu prose. His Jāsūsī Duniyā and Imrān Series are responsible for developing lasting characters such as Colonel Faridi, Ali Imran, Juliana, Captain Hameed, and Joseph. Although his life and contributions to Urdu literature have successfully held the attention of scholars but due consideration has not been accorded to the religious aspect of his works. This paper employs the biographical approach to highlight the pluralistic dimensions of his life and writings. It identifies the religious discourses found in the intra-character dialogues of his Imrān Series novels in order to explore his religious views. Further, it argues in favor of his strong support for interreligious harmony and peace and for the promotion of peaceful coexistence among the adherents of Judaism, Christianity, and Islam. However, it is noted that he opposed Zionism as he maintained that its philosophy does not promote peace and harmony. In this world of perpetual change where religious, racial, and communal violence is so common, where religious dissent has already caused enormous human and material loss, and where rigid human behavior creates hatred and dissent, the study of his Imrān Series teaches tolerance and helps to identify elements disturbing the peace of the society.

Organizational adaptability: A reflection based on ex-ante, in action and ex-post conditions

This article aims to analyze the adaptability construct in its nature and development. First, it provides an analytic study about the adaptability literature integrating to a classification based on different areas of business. Likewise, these contributions are classified in two categories: general and specific and five subcategories: strategic, structural, human talent, production and marketing approaches. Next, a dynamic model is used for representing the flexible and rigid organizational behavior for confronting a changing environment. Then, a second model developing this construct is offered with three important moments: ex-ante, in-action and ex-post as conditions of adaptive organizational behavior. In the end, a reflection about consequences of these structures is added.

Sloshing reduced-order models for aeroelastic analyses of innovative aircraft configurations

The present paper introduces the sloshing effects on aeroelastic stability and response of flying wing configurations. Using reduced order model based on data provided by computational fluid dynamics data, the description of the slosh dynamics is introduced into an integrated modelling that accounts for both rigid and elastic behaviour of flexible aircraft. The fully unsteady aerodynamics, modelled in the frequency domain via doublet lattice method, is recast in time-domain state-space form through the rational function approximation. The reference aircraft is the Body Freedom Flutter equipped with a single tank of cylindrical geometry, partially filled with water, and located underneath the center of mass. The results of the stability and response analyses are compared with the frozen fluid case with the final aim of showing how the fluid movement affects the complete aircraft behaviour.

El funcionamiento cognitivo como endofenotipo de la anorexia nerviosa. Estudio en familiares no afectados por la enfermedad

The cognitive profile of patients with anorexia nervosa is characterized by difficulties in central coherence and mental flexibility. Central coherence is defined by the ability to integrate incoming information in its own context, and weakness in central coherence is characterized by poor overall processing and superior detail processing. Mental flexibility is defined by the ability to change the course of a thought or action according to the demands of the environment. Alterations in this cognitive domain generate rigid and inflexible behavior. An open question in the literature is whether these cognitive characteristics are a transient state derived from the disease or whether they are stable traits associated with anorexia nervosa and endophenotypical features of this disease. The concept of endophenotype refers to the internal phenotype that is not clinically appreciable but can be observed indirectly through deficits that arise in the performance of certain neuropsychological tests. In recent years the search for endophenotypes has been renewed in the field of psychiatry as they would constitute an important route for the understanding of the biological and genetic bases of mental illnesses, constituting markers that allow a diagnosis before the onset of clinical symptomatology. For a cognitive marker to be considered an endophenotype it must meet a series of characteristics such as being measurable, inherited, found in patients with and without active disease and in first-degree relatives not affected by the disease. The aim of the present study was to assess whether difficulties in central coherence and mental flexibility are shared by unaffected first-degree relatives of patients with anorexia nervosa and thus constitute an endophenotypical feature of this disease. This is a cross-sectional, descriptive-comparative study in which 34 women participated: 17 unaffected first-degree relatives of patients with anorexia nervosa (mothers and sisters) and 17 healthy controls matched by age and education. For the study of central coherence the copy of Rey’s Complex Figure was used and to assess set-shifting the Stroop test, the Trail Making Test B and the Phonological Fluency test were used. Demographic and clinical aspects such as age, educational level, body mass index, anxiety, depression, obsessive-compulsive and eating disorder related symptoms were also evaluated. First-degree relatives of patients with anorexia nervosa showed lower performance on measures of central coherence (p < .05) and phonological fluency (p < .05) than healthy controls. A correlation was observed between the Stroop test and depression and eating disorders symptoms (p < .05). The results of this study show that unaffected first-degree relatives of patients with anorexia nervosa presented alterations in central coherence and, to a lesser degree, in mental flexibility. These results, in addition to previous research in which difficulties persisted even after recovery, indicate that these alterations could be genetically mediated, constituting a characteristic trait of anorexia nervosa and therefore a possible candidate for neuropsychological endophenotype of this disease. Regarding practical implications of the study, the findings reinforce the importance of cognitive remediation treatments not only for patients with anorexia nervosa but also emphasize that they could be useful for unaffected family members. Taking into account that family intervention is a widely used tool in the psychological treatment of anorexia, improving the perception of the patient and his relatives about cognitive biases, could contribute to raising awareness of the disease, something that patients with anorexia nervosa do not usually have, and generate a positive impact on the response to treatment as a whole. https://doi.org/10.16888/interd.2022.39.1.7