Search

The current study investigated how stress affects value-based decision-making during spatial navigation and different types of learning underlying decisions. Eighty-two adult participants (42 females) first learned to find object locations in a virtual environment from a fixed starting location (rigid learning) and then to find the same objects from unpredictable starting locations (flexible learning). Participants then decided whether to reach goal objects from the fixed or unpredictable starting location. We found that stress impairs rigid learning in females, and it does not impair, and even improves, flexible learning when performance with rigid learning is controlled for. Critically, examining how earlier learning influences subsequent decision-making using computational models, we found that stress reduces memory integration, making participants more likely to focus on recent memory and less likely to integrate information from other sources. Collectively, our results show how stress impacts different memory systems and the communication between memory and decision-making.

Moving away from the text-centered paradigm in film studies, the present research explores the relationship between the growing popularity of the film in Shanghai during the first two decades of the twentieth century and city governance in the International Settlement. It argues that the rise of movie halls contributed to creating a new kind of crowd that blended Chinese moviegoers with non-Chinese viewers. The emergence of the cinema as a space where people of different racial and ethnic origins encountered impelled the Shanghai Municipal Council – the governing body of the International Settlement in Shanghai – to respond by implementing new measures of public safety and altering its decades-long unspoken rules of segregation in the realm of everyday life. For Chinese enlightenment intellectuals and government officials, meanwhile, anxiety over their fellow Chinese's lack of basic decorum in public spaces arose with the intense intermingling of Chinese and non-Chinese filmgoers under the same roof. Thus, the cinema became a “contact zone” – a space of asymmetrical relations resulting not necessarily from colonists' exercise of colonial power but from the Chinese elite's wrapping of the discussion of movie theater etiquette reform within a political and ideological framework of modernization, patriotism, and anti-imperialism.

OBJECTIVE This study evaluated whether vestibular dysfunction is associated with reduced spatial navigation performance. STUDY DESIGN Cross-sectional study. SETTING Otolaryngology Clinic in the Johns Hopkins Outpatient Center and an analogous virtual reality (VR) environment. PATIENTS Eligible patients had diagnosis of unilateral or bilateral vestibular loss. Matched healthy controls were recruited at 1:1 ratio. INTERVENTIONS The navigation task involved a route-based or place-based strategy in both real world and VR environments. MAIN OUTCOME MEASURES Navigation performance was measured by distance travelled relative to optimal distance (i.e., path ratio) and the Judgments of Relative Direction (JRD) task, whereby participants had to recall relative angular distances between landmarks. RESULTS The study sample included 20 patients with vestibular loss (mean age: 61 yrs, SD: 10.2 yrs) and 20 matched controls (mean age: 60 yrs, SD: 10.4 yrs). Patients with vestibular loss travelled significantly greater distance using both route-based (path ratio 1.3 vs. 1.0, p = 0.02) and place-based (path ratio 2.6 vs. 2.0, p = 0.03) strategies in the real world. Overall, participants performed worse in virtual reality compared to real world in both path ratio (2.2 vs. 1.7; p = 0.04) and JRD error (78° vs. 67°; p

This article examines the afforestation movement in the West Lake area in Mao's China (1949–1976). I argue that this campaign was, by its nature, propagandistic, for it created a narrative of a deforested China before 1949 and a greener land after 1949 to serve the purpose of justifying China's new political system and popularizing socialist ideologies. Hence, such projects helped to define what socialism was in China and thereby solicited the participation of the general population. This afforestation project, engineered to legitimize the Chinese Communist Party's (CCP) rule in China both domestically and internationally, was, however, marred by both human and non-human actors. Local inhabitants who were intent upon protecting their own private properties vis-à-vis the collectivizing state, poachers who illegally felled trees for firewood and timber, and tea growers who were keen on expanding their tea plantations at the cost of mountain forests sabotaged the CCP's afforestation efforts. Meanwhile, various pests contributed to the massive death of newly planted trees and prompted local cadres and citizens to adjust afforestation policies throughout Mao's times. I argue that human and non-human actors possessed non-purposive agency—that is, agency not driven by their intentions and purposes but defined by their actions—to affect, deflect, and undercut the CCP's political agendas.

This article focuses on Zhao Dan’s (1915–1980) career in film after 1949 to investigate a specific type of stardom unique to Mao Zedong’s China (1949–1976). We argue that this new stardom was similar to what conventionally defines stardom, but with an added political dimension: Zhao Dan’s acquisition of high political standing in the People’s Republic of China (PRC). To arrive at a fuller understanding of the state–artist relationship in the PRC, this article challenges the paradigm of accommodation and resistance between the tyrannical state and subordinated artists, which presupposes a subjectivity or selfhood on the part of artists that pre-existed and was maintained against the intrusive hegemonic ideologies of the state. Instead, we underscore that the making of Zhao Dan’s subjectivity in the PRC—his subjectivity-in-stardom in this case—was a dynamic process, a “becoming.” Zhao Dan’s checkered career indicates that he not only acclimated himself to the ever-changing political atmosphere of Mao-era China but also sought to benefit from it.

A substantial amount of research has been conducted to uncover factors underlying the pronounced individual differences in spatial navigation. Spatial working memory capacity (SWM) is shown to be one important factor. In other domains such as reading comprehension, the role of working memory capacity in task performance differences depends on the difficulty of other task demands. In the current study, we investigated whether, similarly, the relationship between SWM and spatial performance was dependent on the difficulty of spatial information integration in the environment. Based on our prior work, spatial information integration difficulty depends on (a) difficulty in observing spatial relationships between locations of interest in the environment and (b) the individual's ability to integrate such relationships. Leveraging virtual reality, we manipulated the difficulty in observing the spatial relationships during learning by changing the visibility of the buildings, and measured individual's self-report sense of direction (SOD) which modulates the ability to integrate such relationships under different degrees of visibility. We consistently found that in the "easy" spatial integration condition (high SOD with high visibility), high SWM did not significantly improve spatial learning. The same pattern was observed in the difficult condition (low SOD with low visibility). On the other hand, high SWM improved spatial learning for medium difficulty (high SOD with low visibility, or vice versa). Together, our results reveal that the role of SWM in spatial learning differences depends on spatial integration difficulty. Our results also have significant applied implications for using virtual reality to target and facilitate spatial learning. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Valued-based decision-making has been studied for decades in myriad topics such as consumer spending and gambling, but very rarely in spatial navigation despite the link between the two being highly relevant to survival. Furthermore, how people integrate episodic memories, and what factors are related to the extent of memory integration in value-based decision-making, remain largely unknown. In the current study, participants learned locations of various objects in a virtual environment and then decided whether to reach goal objects from familiar starting locations or unpredictable ones, with different penalties associated with each option. We developed computational models to test whether, when given an object to find, participants' starting location decisions reflected their past performance specific to that goal (Target-specific model) or integrated memory from performance with all goals in the environment (Target-common model). Because participants' wayfinding performance improved throughout the experiment, we were able to examine what factors related to the generalization of past experience. We found that most participants' decisions were better fit by the Target-common model, and for the people whose decisions were better fit by the Target-common model this integrative tendency may be tied to their concurrently greater performance variability with individual targets. Moreover, greater success on our task was predicted by an interaction between the ability to estimate probabilities relevant to decision-making and self-report general task ability. Collectively, our results show how related navigational episodic memories can be reflected in decision-making, and uncover individual differences contributing to such processes. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

When navigating our world we often first plan or retrieve a route to our goal, avoiding alternative paths to other destinations. Inspired by computational and animal models, we have recently demonstrated evidence that the human hippocampus supports prospective spatial coding, mediated by interactions with the prefrontal cortex. But the relationship between such signals and the need to discriminate possible routes based on their goal remains unclear. In the current study, we combined human fMRI, multi-voxel pattern analysis, and an established paradigm for contrasting memories of nonoverlapping routes with those of routes that cross paths and must be disambiguated. By classifying goal-oriented representations at the initiation of a navigational route, we demonstrate that environmental overlap modulates goal-oriented representations in the hippocampus. This modulation manifest through representational shifts from posterior to anterior components of the right hippocampus. Moreover, declines in goal-oriented decoding due to overlapping memories were predicted by the strength of the alternative memory, suggesting co-expression and competition between alternatives in the hippocampus during prospective thought. Moreover, exploratory whole-brain analyses revealed that a region of frontopolar cortex, which we have previously tied to prospective route planning, represented goal-states in new overlapping routes. Together, our findings provide insight into the influences of contextual overlap on the long-axis of the hippocampus and a broader memory and planning network that we have long-associated with such navigation tasks.

Lyle Fearnley’s Virulent Zones: Animal Disease and Global Health at China’s Pandemic Epicenter offers a gripping anthropological account of the search for the origins of influenza pandemics in Chin...

Previous studies from psychology, neuroscience and geography showed that environmental barriers fragment the representation of the environment, reduce spatial navigation efficiency, distort distance estimation and make spatial updating difficult. Despite these negative effects, limited research has examined how to overcome barriers and if individual differences mediate their causes and potential interventions. We hypothesize that the reduced visibility caused by barriers plays a major role in accumulating error in spatial updating and encoding spatial relationships. We tested this using virtual navigation to grant participants ‘X-ray’ vision during environment encoding (i.e., barriers become translucent) and quantifying cognitive mapping benefits of counteracting fragmented visibility. We found that compared to the participants trained with naturalistic environment visibility, participants trained in the translucent environment had better performance in wayfinding and pointing tasks, which are theorized to measure navigation efficiency and cognitive mapping. Interestingly, these benefits were only observed in participants with high self-report sense of direction. Together, our results provide important insight into (1) how perceptual barrier effects manifest, even when physical fragmentation of space is held constant, (2) establish a novel intervention that can improve spatial learning, and (3) provide evidence that individual differences modulate perceptual barrier effects and the efficacy of such interventions.

Introduction We and collaborators discovered that flickering lights and sound at gamma frequency (40 Hz) reduce Alzheimer's disease (AD) pathology and alter immune cells and signaling in mice. To determine the feasibility of this intervention in humans we tested the safety, tolerability, and daily adherence to extended audiovisual gamma flicker stimulation. Methods Ten patients with mild cognitive impairment due to underlying AD received 1‐hour daily gamma flicker using audiovisual stimulation for 4 or 8 weeks at home with a delayed start design. Results Gamma flicker was safe, tolerable, and adherable. Participants’ neural activity entrained to stimulation. Magnetic resonance imaging and cerebral spinal fluid proteomics show preliminary evidence that prolonged flicker affects neural networks and immune factors in the nervous system. Discussion These findings show that prolonged gamma sensory flicker is safe, tolerable, and feasible with preliminary indications of immune and network effects, supporting further study of gamma stimulation in AD.

A fundamental question in memory research is how the hippocampus processes contextual cues to retrieve distinct mnemonic associations. Prior research has emphasized the importance of hippocampal-prefrontal interactions for context-dependent memory. Our fMRI study examined the human medial temporal lobes (MTL) and their prefrontal interactions when retrieving memories associated with hierarchically organized task contexts. Participants learned virtual object-location associations governed by subordinate and superordinate task rules, which could be independently cued to change. On each fMRI trial, participants retrieved the correct object for convergent rule and location contextual information. Results demonstrated that hippocampal activity and hippocampal-prefrontal functional interconnectivity distinguished retrieval under different levels of hierarchically organized task rules. In explicit contrast to the hippocampal tail, anterior (body and head) regions were recruited specifically for superordinate changes in the contextual hierarchy. The hippocampal body also differed in its functional connectivity with the prefrontal cortex for superordinate versus subordinate changes. Our findings demonstrate a gradient in MTL for associative retrieval under changing task rules, and advance understanding of hippocampal-prefrontal interactions that support flexible contextual memory.

Plate structures suffering thermal environments are often encountered in practice. In this paper, thermal buckling behavior of complex-shaped plates by an adaptive multi-patch isogeometric analysis (IGA) based on locally refined NURBS and Nitsche’s method is studied. Kinematic equations are derived using Reissner–Mindlin plate theory, while complex geometries of plates are represented with multiple patches, where the connection between two adjacent patches is constructed through Nitsche’s method. To conduct adaptive local refinement, structural mesh refinement strategy is combined with a posterior error estimator, which is defined according to the recovered stresses of the first thermal buckling mode. Numerical examples of plates with simple and complex geometries are considered. The accuracy of critical buckling temperature rise obtained from this study is verified against reference solutions.

Marked individual differences in the ability to mentally map our environment are pronounced not only among people of different ages or clinical conditions, but also within healthy young adults. Previous studies have shown that hippocampus size positively correlated with spatial navigation ability in healthy young adults, navigation experts, and patients with hippocampus lesions. However, a recent pre-registered study (Weisberg, Newcombe, & Chatterjee, 2019) with a large sample size (n = 90) did not observe this correlation in healthy young adults. Motivated by evidence that self-report sense of direction (SOD) could have a profound impact on how individuals utilize environmental cues, and that different navigation strategies could have opposite impacts on wayfinding performance in individuals with different cognitive map formation (CMF) abilities, we reanalyzed the publicly available dataset from Weisberg et al.'s study. We tested the influence of participants' SOD and CMF abilities on hippocampal volume–performance relationships. We find evidence that the non-significant correlation could envelop heterogeneous correlations among subgroups of individuals: the correlation between the right posterior hippocampal volume and spatial learning performance is significantly higher among individuals with high spatial ability than individuals with low spatial ability. This pattern of performance was observed for both SOD and CMF moderations of the relationship between hippocampal volume and spatial learning. While our re-analyses are fundamentally exploratory in nature, the new results imply that the relationship between hippocampal volume and spatial learning performance might be more complicated than previously thought.

Summary Environmental barriers fundamentally shape our behavior and conceptualization of space [ 1 , 2 , 3 , 4 , 5 ]. Evidence from rodents suggests that, in contrast to an open-field environment, where grid cells exhibit firing patterns with a 6-fold rotational symmetry [ 5 , 6 ], barriers within the field abolish the 6-fold symmetry and fragment the grid firing fields into compartmentalized repeating “submaps” [ 5 ]. These results suggest that barriers may exert their influence on the cognitive map through organization of the metric representation of space provided by entorhinal neurons. We directly tested this hypothesis in humans, combining functional MRI with a virtual navigation paradigm in which we manipulated the local barrier structure. When participants performed a fixed-route foraging task in an open field, the functional MRI signal in right entorhinal cortex exhibited a 6-fold periodic modulation by movement direction associated with conjunctive grid cell firing [ 7 ]. However, when environments were compartmentalized by barriers, the grid-like 6-fold spatial metric was abolished. Instead, a 4-fold modulation of the entorhinal signal was observed, consistent with a vectorized organization of spatial metrics predicted by rodent models of navigation [ 5 ]. Collectively, these results provide mechanistic insight into why barriers compartmentalize our cognitive map, indicating that boundaries exert a powerful influence on the way environments are represented in human entorhinal cortex. Given that our daily environments are rarely wide open and are often segmented by barriers (e.g., the buildings of our home city), our findings have implications for applying models of cognitive mapping based on grid-like metrics [ 8 ] to naturalistic circumstances.

In the current study, we investigated the ways in which the acquisition and transfer of spatial knowledge were affected by (a) the type of spatial relations predominately experienced during learning (routes determined by walkways vs. straight-line paths between locations); (b) environmental complexity; and (c) the availability of rotational body-based information. Participants learned the layout of a virtual shopping mall by repeatedly searching for target storefronts located in 1 of the buildings. We created 2 novel learning conditions to encourage participants to use either route knowledge (paths on walkways between buildings) or survey knowledge (straight-line distances and directions from storefront to storefront) to find the target, and measured the development of route and survey knowledge in both learning conditions. Environmental complexity was manipulated by varying the alignment of the buildings with the enclosure, and the visibility within space. Body-based information was manipulated by having participants perform the experiment in front of a computer monitor or using a head-mounted display. After navigation, participants pointed to various storefronts from a fixed position and orientation. Results showed that the frequently used spatial knowledge could be developed similarly across environments with different complexities, but the infrequently used spatial knowledge was less developed in the complex environment. Furthermore, rotational body-based information facilitated spatial learning under certain conditions. Our results suggest that path integration may play an important role in spatial knowledge transfer, both from route to survey knowledge (cognitive map construction), and from survey to route knowledge (using cognitive map to guide wayfinding). (PsycINFO Database Record (c) 2019 APA, all rights reserved).

There has been great interest in how previously acquired knowledge interacts with newly learned knowledge and how prior knowledge facilitates semantic and "schema" learning. In studies of episodic memory, it is broadly associated with interference. Very few studies have examined the balance between interference and facilitation over the course of temporally-extended events and its individual differences. In the present study, we recruited 120 participants for a two-day spatial navigation experiment, wherein participants on Day 2 navigated virtual routes that were learned from Day 1 while also learning new routes. Critically, half of the new mazes overlapped with the old mazes, while the other half did not, enabling us to examine interference and facilitation in the context of spatial episodic learning. Overall, we found that navigation performance in new mazes that overlapped with previously-learned routes was significantly worse than the new non-overlapping mazes, suggesting proactive interference. Interestingly, we found memory facilitation for new routes in familiar environments in locations where there was no direct overlap with the previously-learned routes. Cognitive map accuracy positively correlated with proactive interference. Moreover, participants with high self-report spatial ability and/or a preference for place-based learning experienced more proactive interference. Taken together, our results show that 1) both memory interference and facilitation can co-occur as a function of prior learning, 2) proactive interference within a route varied as a function of the degree of overlap with old knowledge, and 3) individual differences in spatial ability and strategy can modulate proactive interference.

This article focuses on the extravagant funeral procession of Sheng Xuanhuai (1844–1916) in November 1917. This mile-long procession attracted over a million spectators and, thereby, lent the residents and sojourners in Shanghai of the day a unique visual sensibility of the modern urban milieu. Various parties to the funeral procession—namely the colonial authorities, the bereaved family, businessmen, and lower-class spectators—developed various tactics to manipulate the spectacle of the procession for political control, commercial gains, and visual pleasure. The author argues that the spectacularization of daily life, as exemplified by the 1917 funeral procession, and a collective will to look and to be looked at in early twentieth-century China, contributed to binding together otherwise segregated people, thus restructuring interpersonal relationships in the modernized city of Shanghai.

The capacity to remain spatially oriented is an essential function in our day to day lives and it seems that the form in which we acquire the spatial information affects the way in which the spatial knowledge is represented in our memory. The goal of this research was to investigate whether the acquisition of spatial information through the learning of three routes within an immersive environment was improved or impaired when participants have access to the backward perspective in addition to the forward perspective. Results, both in reproduction and drawing tasks, showed a poorer performance of the bidirectional group maybe due to the extra-effort involved in updating the spatial information trial by trial. However it seems that the experience enhanced the performance of the bidirectional group in one respect, as they were able to reduce significantly the number of error directions in the last path.

The love affair provides a lens to examine the rise of an urban network of communication that featured both newspaper and non-newspaper media in the late 1920s. In this period, a new trend of journalism set in—namely, the concentration of capital and cut-throat competition among high-budget daily newspapers. In order to survive and thrive, second-tier newspapers resorted to high-profile social news, such as the Huang–Lu affair, to both reap profits and impart behavioral codes. Beyond the newspaper media, a concerted effort by dramatists, publishers, pop singers, folklorists, street artists, and gramophone record companies to represent the case testifies to the flowering of web of communication that linked consumers of various social and economic backgrounds. In this network, consumers, especially low-brow ones, vernacularized May-Fourth feminist and sexological notions to arrive at their understandings of the elopement and to show their worthiness as members of modern society.

This chapter centers on the coverage of the Huang–Lu elopement by various periodicals across the Yangzi Delta as a social drama to cater to the tastes of their readership. It highlights complex interactions among the media, the protagonists of the case, and the readers. Journalists worked hard to cast Huang Huiru variously as a “new woman” fighting for marital freedom, a femme fatale whose sexual desire caused the man’s legal trouble, or a defenseless girl falling prey to a male sexual offender. Journalists gained inspirations from both foreign films and China’s classical fiction to imagine and represent the love affair. The protagonists of the elopement, Huang and Lu, obtained, displayed, and changed their personal identities in accordance with the images journalists gave them in the press and altered the course of their lives accordingly.