Article
Computer Science, Information Systems
Chuanjin Dai, Lijin Xie
Summary: Self-location is crucial for autonomous navigation, especially in a GNSS/radio-denied environment. Researchers have proposed a method based on the mechanism of grid cells to achieve a wider spatial range without phase noise, by using a multi-scale periodic representation mechanism supported by a step-wise phase unwrapping algorithm.
Article
Multidisciplinary Sciences
H. L. Payne, G. F. Lynch, D. Aronov
Summary: The study shows that the neural circuit mechanisms in the hippocampus are similar between birds and mammals, but the resulting patterns of activity may vary quantitatively according to species-specific ethological needs.
Article
Multidisciplinary Sciences
Dong Chen, Lukas Kunz, Pengcheng Lv, Hui Zhang, Wenjing Zhou, Shuli Liang, Nikolai Axmacher, Liang Wang
Summary: Oscillatory theta power in the vmPFC exhibited a sixfold rotational symmetry and was coordinated with grid-like representations in the EC, predicting navigational performance. The study found a unidirectional signal transfer from the vmPFC to the EC during memory retrieval.
Article
Neurosciences
Simone Vigano, Valerio Rubino, Antonio Di Soccio, Marco Buiatti, Manuela Piazza
Summary: The human brain represents relational information about words through grid-like and distance-dependent codes, as shown in a study where participants learned the meaning of novel words while performing a word comparison task.
Article
Neurosciences
James B. Priestley, John C. Bowler, Sebi Rolotti, Stefano Fusi, Attila Losonczy
Summary: Neurons in the hippocampus exhibit selectivity for specific combinations of sensory features, forming representations for episodic memory. During novel experiences, hippocampal "place cells" rapidly adjust to encode visited locations in a sparse manner. The quick encoding is facilitated by behavioral timescale synaptic plasticity, particularly during exploration of a novel context, and decreases with experience.
Article
Automation & Control Systems
A. S. Matveev, M. S. Nikolaev
Summary: This paper presents a hybrid nonlinear navigation law for a non-holonomic constant-speed robot to move in an unknown environment, which does not require estimation of the field gradient and is non-demanding with respect to both computation and motion. The non-local convergence of the proposed algorithm is rigorously justified and confirmed by computer simulation tests.
NONLINEAR ANALYSIS-HYBRID SYSTEMS
(2021)
Article
Chemistry, Multidisciplinary
Pablo Muela, Elisa Cintado, Patricia Tezanos, Benjamin Fernandez-Garcia, Cristina Tomas-Zapico, Eduardo Iglesias-Gutierrez, Angel Enrique Diaz Martinez, Ray G. Butler, Victor Cuadrado-Penafiel, Ricardo De la Vega, Vanesa Soto-Leon, Antonio Oliviero, Laura Lopez-Mascaraque, Jose Luis Trejo
Summary: Spatial navigation is a crucial aspect of human behavior that is still not completely understood. Researchers have developed hardware and protocols to evaluate freely moving humans' spatial navigation abilities in a real space circular arena, providing a flexible and adaptable way to access information about these abilities.
APPLIED SCIENCES-BASEL
(2022)
Article
Robotics
Minsu Cho, Yeongseok Lee, Kyung-Soo Kim
Summary: Nonlinear model predictive control (NMPC) is an efficient and proven method for optimization-based autonomous vehicle motion planning. By converting the inequality-constrained optimization problem into an unconstrained optimization problem, a single unified constraint is designed to simplify complex motion planning problems and reduce computational costs.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2023)
Article
Neurosciences
Iva K. Brunec, Ida Momennejad
Summary: Multiscale predictive representations play a crucial role in naturalistic navigation, organized along the hierarchies of prefrontal and hippocampal regions. The anterior PFC has the longest predictive horizons, while the posterior hippocampus has the shortest.
JOURNAL OF NEUROSCIENCE
(2022)
Article
Neurosciences
Andrew M. Wikenheiser, Matthew P. H. Gardner, Lauren E. Mueller, Geoffrey Schoenbaum
Summary: Research indicates that OFC neurons exhibit spatial firing fields in a manner similar to hippocampus when engaged in a free-foraging task, with different representations observed between flavored and unflavored conditions resembling hippocampal remapping.
JOURNAL OF NEUROSCIENCE
(2021)
Article
Green & Sustainable Science & Technology
Debajit Palit, Atul Kumar
Summary: Despite significant progress, the electrification sector in India still faces multiple challenges. This study examined the drivers and barriers to rural electrification, highlighting the importance of enabling policies and government support. The research identified political, economic, and financial factors as the main drivers for centralized grid expansion, and convergence with livelihood programs and electricity for irrigation as strong drivers for RE-based mini-grids. High electricity costs and customers' inability to pay were perceived as barriers for both central grid and mini-grids.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Cell Biology
Giuliano Giari, Lorenzo Vignali, Yangwen Xu, Roberto Bottini
Summary: This study tested whether movements of covert attention elicit grid-like coding in humans. The results showed that grid-like signals can be elicited by spatial movements of attention and are localized in the medial-temporal lobe. These findings suggest that attentional coding may play a role in supporting the activation of cognitive maps during conceptual navigation.
Article
Multidisciplinary Sciences
Angelica Gualtieri, Nikolina Kyprianou, Louise C. Gregory, Maria Lillina Vignola, James G. Nicholson, Rachael Tan, Shin-ichi Inoue, Valeria Scagliotti, Pedro Casado, James Blackburn, Fernando Abollo-Jimenez, Eugenia Marinelli, Rachael E. J. Besser, Wolfgang Hoegler, I. Karen Temple, Justin H. Davies, Andrey Gagunashvili, Iain C. A. F. Robinson, Sally A. Camper, Shannon W. Davis, Pedro R. Cutillas, Evelien F. Gevers, Yoko Aoki, Mehul T. Dattani, Carles Gaston-Massuet
Summary: Mutations in BRAF and other components of the MAP kinase pathway are associated with RASopathies, leading to congenital syndromes such as Septo-Optic Dysplasia and Cardio-Facio-Cutaneous syndrome. The gain-of-function mutations in BRAF are shown to play a critical role in the development of the hypothalamo-pituitary axis, resulting in endocrine deficiencies in patients with RASopathies.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Christine Grienberger, Jeffrey C. Magee
Summary: This study reveals that learning-related changes in the hippocampus are produced by synaptic plasticity directed by an instructive signal from the entorhinal cortex layer 3 that seems to be specifically adapted to the behaviorally relevant features of the environment.
Article
Behavioral Sciences
Yu Karen Du, Mingli Liang, Andrew S. Mcavan, Robert C. Wilson, Arne D. Ekstrom
Summary: Previous research has shown that intersections play a crucial role in the early development of spatial representations during navigation. The timing of path segments, including intersections, is strongly associated with later pointing error. Oscillatory signals recorded from scalp EEG can be used to identify when representations based on self-motion and landmark cues first emerge.
Article
Biochemistry & Molecular Biology
Thackery Brown, Stephanie A. Gagnon, Anthony D. Wagner
Article
Neurosciences
Thackery I. Brown, Qiliang He, Irem Aselcioglu, Chantal E. Stern
Summary: The study found that hippocampal activity and hippocampal-prefrontal functional interconnectivity distinguish retrieval under different levels of hierarchically organized task rules. The anterior regions were specifically recruited for superordinate changes in the contextual hierarchy, while the hippocampal body showed differences in functional connectivity with the prefrontal cortex for superordinate versus subordinate changes.
Article
Clinical Neurology
Kevin Biju, Eric X. Wei, Elliott Rebello, Jacob Matthews, Qiliang He, Timothy P. McNamara, Yuri Agrawal
Summary: This study found that patients with vestibular dysfunction performed worse in navigation tasks, both in real world and virtual reality environments, suggesting a role for the vestibular system in navigation performance. Controls showed positive correlations between real world and VR performance, while patients with vestibular loss did not exhibit similar correlations.
OTOLOGY & NEUROTOLOGY
(2021)
Article
Psychology, Experimental
Paulina Maxim, Thackery I. Brown
Summary: This paper presents an overview of schema theory and its relevance to navigational memory research. It discusses the mechanisms underlying individual differences in navigational memory by manipulating environmental complexity and affective state, and emphasizes the potential for advancing our understanding of cognitive decline with aging.
TOPICS IN COGNITIVE SCIENCE
(2023)
Article
Neurosciences
Qiliang He, Jon Starnes, Thackery Brown
Summary: This study used multi-voxel pattern analysis combined with human fMRI to investigate the influence of environmental overlap on goal-oriented representations in the hippocampus. The results showed that environmental overlap leads to a decline in goal-oriented decoding in the hippocampus, and this decline is related to the strength of alternative memories. Furthermore, the frontopolar cortex is also involved in representing goal-states.
Article
Psychology
Qiliang He, Jancy Ling Liu, Elizabeth H. Beveridge, Lou Eschapasse, Vanesa Vargas, Thackery Brown
Summary: Valued-based decision-making in spatial navigation and the integration of episodic memories remain largely unknown. This study found that participants' starting location decisions in goal-directed tasks were better fit by integrating memory from performance with all goals in the environment, rather than reflecting past performance specific to that goal. Individual differences in performance variability with individual targets and the ability to estimate relevant probabilities were predictors of task success.
JOURNAL OF EXPERIMENTAL PSYCHOLOGY-LEARNING MEMORY AND COGNITION
(2022)
Article
Multidisciplinary Sciences
Qiliang He, Jancy Ling Liu, Lou Eschapasse, Elizabeth H. Beveridge, Thackery Brown
Summary: This study found that a hybrid model is the most suitable for characterizing human navigation behaviors under different requirements. Most participants rely on a combination of model-free and model-based learning in navigation tasks. Additionally, the relationship between navigation strategy and consistency of using such strategies changes as navigation requirements change.
SCIENTIFIC REPORTS
(2022)
Article
Psychology, Multidisciplinary
Qiliang He, Elizabeth H. Beveridge, Vanesa Vargas, Ashley Salen, Thackery I. Brown
Summary: The study examined the impact of stress on value-based decision-making during spatial navigation and different types of learning. It was found that stress impairs rigid learning in females, but does not have negative effects on flexible learning and may even improve it. Computational models revealed that stress reduces memory integration, leading participants to rely more on recent memory and less on information from other sources when making decisions. Overall, the results demonstrate how stress affects different memory systems and the communication between memory and decision-making.
PSYCHOLOGICAL SCIENCE
(2023)
Article
Psychology, Experimental
Qiliang He, Andrew T. Han, Tanya A. Churaman, Thackery Brown
Summary: This study found that the role of spatial working memory capacity in spatial learning differences depends on the difficulty of spatial information integration. Depending on the difficulty level of spatial integration, high SWM may or may not significantly improve spatial learning performance.
JOURNAL OF EXPERIMENTAL PSYCHOLOGY-GENERAL
(2021)
Article
Psychology, Experimental
Qiliang He, Elizabeth H. Beveridge, Jon Starnes, Sarah C. Goodroe, Thackery I. Brown
Summary: The study found that new navigation performance was significantly worse in routes overlapping with previously-learned ones, indicating proactive interference. Interestingly, new routes in familiar environments showed memory facilitation in locations where there was no direct overlap with old routes. Cognitive map accuracy was positively correlated with proactive interference. Participants with high spatial ability and preference for place-based learning experienced more proactive interference.