Everyday‐like memory for objects in ageing and Alzheimer's disease assessed in a visually complex environment: The role of executive functioning and episodic memory

To investigate everyday memory, more and more studies rely on virtual‐reality applications to bridge the gap between in situ approaches and laboratory settings. In this vein, the present study was designed to assess everyday‐like memory from the virtual reality‐based Human Object Memory for Everyday Scenes (HOMES) test (Sauzéon et al., 2012 , Exp. Psychol., 59, 99) in ageing and in Alzheimer's disease (AD). Two aims motivated this study: the first was to assess multiple processes of episodic memory (EM) functioning embedded within contexts closely related to real life in ageing and AD using the multi‐trial free‐recall paradigm, and the second aim was to evaluate the mediating effects of executive functioning (EF), EM, and subjective memory complaints (SMCs) on age differences in the HOMES measures and in AD. To this end, the HOMES test and neurocognitive tests of EF and EM were administered to 23 younger adults, 23 older adults, and 16 patients with AD. The results were: firstly, compared to young adults, elderly adults presented only free‐recall decline that almost disappeared in recognition condition whereas AD patients exhibited a poor clustering, learning, and recognition performance, and also a high amount of false recognition; secondly, age differences as well as AD related deficits on the HOMES test were mediated by both memory and EF measure while those observed on false memory indices were only mediated by EM measure; thirdly, the HOMES indices are related to SMCs even when episodic or EF measures are controlled. Overall, the results supported the fact that the VR‐based memory test is an appropriate device to capture age‐related differences as well as the AD effect with respect to both in situ and laboratory settings.     

Auto-immunity in the study of religions(s): Ontotheology,historicism and the theorization of Indic culture

Despite the prevalence of post-colonial theory in the humanities and social sciences, why is it that the two main secular formations in the study of religion(s), as philosophy of religion and history of religions, continue to deploy very similar mechanisms that reconstitute past imperialisms such as the hegemony of theory as specifically Western and/or the division of labor between universal and particular knowledge formations? To answer this question this paper stages an oblique engagement between the seemingly divergent discourses: (i) philosophy of religion, (ii) history of religion—more specifically the area specialism called South Asian religions, and (iii) post-colonial theory especially where these discourses intersect with the discipline of Indology and the representation of Indic phenomena. A different version of this engagement occurs in Hegel’s Lectures on the Philosophy of Religion (LPR). A post-colonial reading of the LPR reveals closer and often unacknowledged connections between the birth of these two disciplines. More importantly the LPR anticipates the auto-immunizing mechanism that underpins the continued lack of engagement between the various disciplines of contemporary religions. Ironically, this mechanism, it will be argued, is located in the very heart of the comparative enterprise itself.     

The use of virtual reality for episodic memory assessment: effects of active navigation

Episodic memory was assessed using Virtual Reality (VR). Forty-four (44) subjects visualized a target virtual apartment containing specific objects in each room. Then they visualized a second virtual apartment comprised of specific objects and objects shared by the two apartments. Subjects navigated in the virtual apartments in one of the following two conditions: active and passive. Four main episodic memory components were scored from the VR exposures: (1) learning effect; (2) active forgetting effect; (3) strategies at encoding and at retrieval; and (4) false recognitions (FRs). The effect of navigation mode (active vs. passive) on each memory component was examined. Active subjects had better learning and retrieval (recognition hits) performances compared to passive subjects. A beneficial effect of active navigation was also observed on the source-based FR rates. Active subjects made fewer source-based FRs compared to passive subjects. These overall results for the effect of active navigation are discussed in terms of the distinction between item-specific and relational processing.     

Imaging intelligence with proton magnetic resonance spectroscopy

Proton magnetic resonance spectroscopy (¹H-MRS) is a technique for the assay of brain neurochemistry in vivo. N-acetylaspartate (NAA), the most prominent metabolite visible within the ¹H-MRS spectrum, is found primarily within neurons. The current study was designed to further elucidate NAA–cognition relationships, particularly whether such relationships are moderated by sex, or tissue type (gray or white matter). We administered standard measures of intelligence to 63 young, healthy subjects and obtained spectroscopic imaging data within a slab of tissue superior to the lateral ventricles. We found that lower NAA within right anterior gray matter predicted better performance VIQ (F = 6.83, p = .011, r² = .10), while higher NAA within the right posterior gray matter region predicted better PIQ (F = 8.175, p = .006, r² = .12). These findings add to the small but growing body of literature linking brain biochemistry to intelligence in normal healthy subjects using ¹H-MRSI.     

Virtual/real transfer of spatial knowledge: benefit from visual fidelity provided in a virtual environment and impact of active navigation

The purpose of this study was to evaluate the effect the visual fidelity of a virtual environment (VE) (undetailed vs. detailed) has on the transfer of spatial knowledge based on the navigation mode (passive vs. active) for three different spatial recall tasks (wayfinding, sketch mapping, and picture sorting). Sixty-four subjects (32 men and 32 women) participated in the experiment. Spatial learning was evaluated by these three tasks in the context of the Bordeaux district. In the wayfinding task, the results indicated that the detailed VE helped subjects to transfer their spatial knowledge from the VE to the real world, irrespective of the navigation mode. In the sketch-mapping task, the detailed VE increased performances compared to the undetailed VE condition, and allowed subjects to benefit from the active navigation. In the sorting task, performances were better in the detailed VE; however, in the undetailed version of the VE, active learning either did not help the subjects or it even deteriorated their performances. These results are discussed in terms of appropriate perceptive-motor and/or spatial representations for each spatial recall task.     

Jivanmukti in Neo‐Hinduism: The case of Ramana Maharsi

Jivanmukti or ‘living liberation’ has been identified as a distinguishing feature of Indian thought; or, upon drawing a narrower circle, of Hindu thought; and upon drawing an even narrower cocentric circle of Vedānta—of Advaita Vedānta. In some recent studies the cogency of its formulation within Advaita Vedānta has been questioned—but without reference to the testimony of its major modem exemplar, Ramana Maharsi (1879–1950). This paper examines the significance of the life and statements of Ramana Maharsi for the current debate in the context of neo‐Hinduism     

Is Ultimate Attribution Error Universal? Inter-group Attribution for Success and Failure among University Students in Delhi

Research on inter-group attribution and ultimate attribution error has mostly focused on religious and ethnic groups. However, in view of the distinct nature of Indian social structure, this study examined inter-group attributions in caste context. The study was conducted with university students belonging to two caste groups. A total of 95 students participated in the study: 51 from General Caste category and 44 from Scheduled Caste category. Hypothetical situations were used to record attributions made for the success and failure of both in-group and out-group along the dimensions of locus of causality, stability, and controllability. Results indicated that General Caste category participants showed no inter-group attribution bias. Moreover, Scheduled Caste category participants showed a pattern of in-group derogation. These results are explained in terms of role of education and ideology in influencing the inter-group attribution process, suggesting that ultimate attribution error is not universal.

     

Age and active navigation effects on episodic memory: A virtual reality study

We investigated the navigation‐related age effects on learning, proactive interference semantic clustering, recognition hits, and false recognitions in a naturalistic situation using a virtual apartment‐based task. We also examined the neuropsychological correlates (executive functioning [EF] and episodic memory) of navigation‐related age effects on memory. Younger and older adults either actively navigated or passively followed the computer‐guided tour of an apartment. The results indicated that active navigation increased recognition hits compared with passive navigation, but it did not influence other memory measures (learning, proactive interference, and semantic clustering) to a similar extent in either age group. Furthermore, active navigation helped to reduce false recognitions in younger adults but increased those made by older adults. This differential effect of active navigation for younger and older adults was accounted for by EF score. Like for the subject‐performed task effects, the effects from the navigation manipulation were well accounted for by item‐specific/relational processing distinction, and they were also consistent with a source monitoring deficit in older adults.     

Surrogate medical decision making on behalf of a never-competent, profoundly intellectually disabled patient who is acutely ill

With the improvements in medical care and resultant increase in life expectancy of the intellectually disabled, it will become more common for healthcare providers to be confronted by ethical dilemmas in the care of this patient population. Many of the dilemmas will focus on what is in the best interest of patients who have never been able to express their wishes with regard to medical and end-of-life care and who should be empowered to exercise surrogate medical decision-making authority on their behalf. A case is presented that exemplifies the ethical and legal tensions surrounding surrogate medical decision making for acutely ill, never-competent, profoundly intellectually disabled patients.