Revonsuo proposed an intriguing and detailed evolutionary theory of dreams which stipulates that the biological function of dreaming is to simulate threatening events and to rehearse threat avoidance behaviors. The goal of the present study was to test this theory using a sample of 212 recurrent dreams that was scored using a slightly expanded version of the DreamThreat rating scale. Six of the eight hypotheses tested were supported. Among the positive findings, 66% of the recurrent dream reports contained one or (...) more threats, the threats tended to be dangerous and aimed at the dreamer, and when facing a threat, the dreamer tended to take defensive or evasive actions that were possible and reasonable. However, less than 15% of the recurrent dreams depicted realistic and probable situations critical for one’s physical survival or reproductive success and the dreamer rarely succeeded in fleeing the threat despite important and appropriate efforts. The findings thus provide mixed support for the threat simulation theory. (shrink)

How many words—and which ones—are sufficient to define all other words? When dictionaries are analyzed as directed graphs with links from defining words to defined words, they reveal a latent structure. Recursively removing all words that are reachable by definition but that do not define any further words reduces the dictionary to a Kernel of about 10% of its size. This is still not the smallest number of words that can define all the rest. About 75% of the Kernel turns (...) out to be its Core, a “Strongly Connected Subset” of words with a definitional path to and from any pair of its words and no word's definition depending on a word outside the set. But the Core cannot define all the rest of the dictionary. The 25% of the Kernel surrounding the Core consists of small strongly connected subsets of words: the Satellites. The size of the smallest set of words that can define all the rest—the graph's “minimum feedback vertex set” or MinSet—is about 1% of the dictionary, about 15% of the Kernel, and part-Core/part-Satellite. But every dictionary has a huge number of MinSets. The Core words are learned earlier, more frequent, and less concrete than the Satellites, which are in turn learned earlier, more frequent, but more concrete than the rest of the Dictionary. In principle, only one MinSet's words would need to be grounded through the sensorimotor capacity to recognize and categorize their referents. In a dual-code sensorimotor/symbolic model of the mental lexicon, the symbolic code could do all the rest through recombinatory definition. (shrink)

La vida de Siháb al-Din al-Suhrawardi es oscura. Datos aislados referentes a sus estudios, viajes y contactos se encuentran en breves noticias de los diccionarios biográ-ficos de los siglos xn y xm. Estas noticias permiten esbozar una biografía de al-Suhrawardi desde sus comienzos hasta la oposición de que fue objeto por parte de los Memas de Alepo y su trágica muerte, interpretada en el marco y el contexto de la ciu-dad. Todo este material de los diccionarios biográficos es sólo relativamente (...) fidedigno e incluso los textos contemporáneos incluyen datos erróneos. = Shiháb al-Din al-Suhrawardi's life is obscure. Some clues regarding his studies, travels and encounters are found in short biographical notices of the 12th and 13th centuries. These notices can provide the means to sketch al-Suhrawardi's biography: his early life, his coming to Aleppo, the mounting opposition of the Memas of Aleppo, and the final moments that led to his tragic death. The sociopolitical context of Aleppo provides a good framework for the interpretation of the data provided by the biographers. All these biographical works are, however, of relative reliability. Even the most contemporary texts are in fact not devoid of erroneous elements. (shrink)

BackgroundIn the Canadian Alliance for Healthy Hearts and Minds (CAHHM) cohort, participants underwent magnetic resonance imaging (MRI) of the brain, heart, and abdomen, that generated incidental findings (IFs). The approach to managing these unexpected results remain a complex issue. Our objectives were to describe the CAHHM policy for the management of IFs, to understand the impact of disclosing IFs to healthy research participants, and to reflect on the ethical obligations of researchers in future MRI studies.MethodsBetween 2013 and 2019, 8252 participants (...) (mean age 58 ± 9 years, 54% women) were recruited with a follow-up questionnaire administered to 909 participants (40% response rate) at 1-year. The CAHHM policy followed a restricted approach, whereby routine feedback on IFs was not provided. Only IFs of severe structural abnormalities were reported.ResultsSevere structural abnormalities occurred in 8.3% (95% confidence interval 7.7–8.9%) of participants, with the highest proportions found in the brain (4.2%) and abdomen (3.1%). The majority of participants (97%) informed of an IF reported no change in quality of life, with 3% of participants reporting that the knowledge of an IF negatively impacted their quality of life. Furthermore, 50% reported increased stress in learning about an IF, and in 95%, the discovery of an IF did not adversely impact his/her life insurance policy. Most participants (90%) would enrol in the study again and perceived the MRI scan to be beneficial, regardless of whether they were informed of IFs. While the implications of a restricted approach to IF management was perceived to be mostly positive, a degree of diagnostic misconception was present amongst participants, indicating the importance of a more thorough consent process to support participant autonomy.ConclusionThe management of IFs from research MRI scans remain a challenging issue, as participants may experience stress and a reduced quality of life when IFs are disclosed. The restricted approach to IF management in CAHHM demonstrated a fair fulfillment of the overarching ethical principles of respect for autonomy, concern for wellbeing, and justice. The approach outlined in the CAHHM policy may serve as a framework for future research studies.Clinical trial registrationhttps://clinicaltrials.gov/ct2/show/nct02220582. (shrink)

It is estimated that 300,000 children 0–14 years of age are diagnosed with cancer worldwide each year. While the absolute risk of cancer in children is low, it is the leading cause of death due to disease in children in high‐income countries. In spite of this, the etiologies of pediatric cancer are largely unknown. Environmental exposures have long been thought to play an etiologic role. However, to date, there are few well‐established environmental risk factors for pediatric malignancies, likely due to (...) technical barriers in collecting biological samples prospectively in pediatric populations for direct measurements. In this review, we propose the use of novel or underutilized biospecimens (dried blood spots and teeth) and molecular approaches for exposure assessment (epigenetics, metabolomics, and somatic mutational profiles). Future epidemiologic studies of pediatric cancer should incorporate novel exposure assessment methodologies, data on molecular features of tumors, and a more complete assessment of gene‐environment interactions. (shrink)

Shihàb al-Dîn al-Suhrawardfs life is obscure. Some clues regarding his studies, travels and encounters are found in short biographical notices of the 12th and 13th centuries. These notices can provide the means to sketch al-Suhrawardfs biography: his early life, his coming to Aleppo, the mounting opposition of the ulemas of Aleppo, and the final moments that led to his tragic death. The ociopolitical context of Aleppo provides a good framework for the interpretation of the data provided by the biographers. All (...) these biographical works are, however, of relative reliability. Even the most contemporary texts are in fact not devoid of erroneous elements. (c) Consejo Superior de Investigaciones Científicas. (shrink)

This paper will explore the gender discourse of contemporary Egyptian Islamists and argue that their gender discourse is not merely a religious and traditional discourse, but that this politico-religious Islamic ideology articulates a quite modern construct of gender equality. The gender discourse of a number of important Egyptian Islamists, al-Banna’, Qutb, al-Ghazali, al-Qaradawi and Ezzat will provide illustrations of these modern developments. Modern elements incorporated in today’s Islamist revivalist approaches create new understandings, neither purely traditional, nor purely modern, that are (...) ‘modern constructs’ that attempt to remain traditional, while integrating specifically modern components. The presence of these two seemingly opposing and contradictory elements may account for the present popularity that Islamist discourses enjoy in many Muslims countries. (shrink)

Avicenna (d. 1037) bequeathed the Arabic philosophical tradition with an aporia : self-knowledge is conceived, at times, in terms of intellection, at other times, in terms of apperception. In his Book of Discussions and Book of Notes, Avicenna has lengthy discussions on apperception, defined as a direct ontological mode of knowledge. Heir to this tradition, Shihāb al-Dīn al-Suhrawardī (d. 1191) moved away from the first conception of self-knowledge as intellection to adopt the second conception of an apperception of the self (...) as a direct, intuitive and "presential (hcombining dot belowudcombining dot belowūrī)" perception, and which he defended with four types of arguments. (shrink)

Mullā Ṣadrā and Eschatology: Evolution of Being By al-KutubiEiyad S, vii + 151 pp. Price HB £85.00. EAN 978–1138794160.