scholarly journals Weighted cue integration in the rodent head direction system

2014 ◽  
Vol 369 (1635) ◽  
pp. 20120512 ◽  
Author(s):  
Rebecca Knight ◽  
Caitlin E. Piette ◽  
Hector Page ◽  
Daniel Walters ◽  
Elizabeth Marozzi ◽  
...  
Keyword(s):  
Cue Integration ◽  
Head Direction ◽  
Learning Rules ◽  
Visual Inputs ◽  
Sensory Modalities ◽  
Neural Substrate ◽  
Spatial Redistribution ◽  
Sensory Cue ◽  
The Brain ◽  
Dynamic Plasticity

How the brain combines information from different sensory modalities and of differing reliability is an important and still-unanswered question. Using the head direction (HD) system as a model, we explored the resolution of conflicts between landmarks and background cues. Sensory cue integration models predict averaging of the two cues, whereas attractor models predict capture of the signal by the dominant cue. We found that a visual landmark mostly captured the HD signal at low conflicts: however, there was an increasing propensity for the cells to integrate the cues thereafter. A large conflict presented to naive rats resulted in greater visual cue capture (less integration) than in experienced rats, revealing an effect of experience. We propose that weighted cue integration in HD cells arises from dynamic plasticity of the feed-forward inputs to the network, causing within-trial spatial redistribution of the visual inputs onto the ring. This suggests that an attractor network can implement decision processes about cue reliability using simple architecture and learning rules, thus providing a potential neural substrate for weighted cue integration.

scholarly journals Auditory and visual scene analysis: an overview

2017 ◽  
Vol 372 (1714) ◽  
pp. 20160099 ◽  
Author(s):  
Hirohito M. Kondo ◽  
Anouk M. van Loon ◽  
Jun-Ichiro Kawahara ◽  
Brian C. J. Moore
Keyword(s):  
Scene Perception ◽  
Computational Modelling ◽  
Visual Scene ◽  
Scene Analysis ◽  
Theoretical Approaches ◽  
Visual Inputs ◽  
Sensory Modalities ◽  
Stimulus Features ◽  
The Brain ◽  
Selection Of

We perceive the world as stable and composed of discrete objects even though auditory and visual inputs are often ambiguous owing to spatial and temporal occluders and changes in the conditions of observation. This raises important questions regarding where and how ‘scene analysis’ is performed in the brain. Recent advances from both auditory and visual research suggest that the brain does not simply process the incoming scene properties. Rather, top-down processes such as attention, expectations and prior knowledge facilitate scene perception. Thus, scene analysis is linked not only with the extraction of stimulus features and formation and selection of perceptual objects, but also with selective attention, perceptual binding and awareness. This special issue covers novel advances in scene-analysis research obtained using a combination of psychophysics, computational modelling, neuroimaging and neurophysiology, and presents new empirical and theoretical approaches. For integrative understanding of scene analysis beyond and across sensory modalities, we provide a collection of 15 articles that enable comparison and integration of recent findings in auditory and visual scene analysis. This article is part of the themed issue ‘Auditory and visual scene analysis’.

Crossmodal Correspondences: Standing Issues and Experimental Guidelines

2016 ◽  
Vol 29 (1-3) ◽  
pp. 7-28 ◽  
Author(s):  
Cesare V. Parise
Keyword(s):  
Sensory Systems ◽  
Multisensory Perception ◽  
Cue Integration ◽  
Natural Scene Statistics ◽  
Crossmodal Correspondences ◽  
Sensory Features ◽  
Sensory Modalities ◽  
Recent Developments ◽  
Practical Guidelines ◽  
Sensory Cue

Crossmodal correspondences refer to the systematic associations often found across seemingly unrelated sensory features from different sensory modalities. Such phenomena constitute a universal trait of multisensory perception even in non-human species, and seem to result, at least in part, from the adaptation of sensory systems to natural scene statistics. Despite recent developments in the study of crossmodal correspondences, there are still a number of standing questions about their definition, their origins, their plasticity, and their underlying computational mechanisms. In this paper, I will review such questions in the light of current research on sensory cue integration, where crossmodal correspondences can be conceptualized in terms of natural mappings across different sensory cues that are present in the environment and learnt by the sensory systems. Finally, I will provide some practical guidelines for the design of experiments that might shed new light on crossmodal correspondences.

scholarly journals Wireless logging of extracellular neuronal activity in the telencephalon of free-swimming salmonids

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Susumu Takahashi ◽  
Takumi Hombe ◽  
Riku Takahashi ◽  
Kaoru Ide ◽  
Shinichiro Okamoto ◽  
...  
Keyword(s):  
Neuronal Activity ◽  
Environmental Cues ◽  
Fish Movement ◽  
Water Tank ◽  
Head Direction ◽  
Free Swimming ◽  
Rodent Brain ◽  
River Migration ◽  
Spike Waveforms ◽  
The Brain

Abstract Background Salmonids return to the river where they were born in a phenomenon known as mother-river migration. The underpinning of migration has been extensively examined, particularly regarding the behavioral correlations of external environmental cues such as the scent of the mother-river and geomagnetic compass. However, neuronal underpinning remains elusive, as there have been no biologging techniques suited to monitor neuronal activity in the brain of large free-swimming fish. In this study, we developed a wireless biologging system to record extracellular neuronal activity in the brains of free-swimming salmonids. Results Using this system, we recorded multiple neuronal activities from the telencephalon of trout swimming in a rectangular water tank. As proof of principle, we examined the activity statistics for extracellular spike waveforms and timing. We found cells firing maximally in response to a specific head direction, similar to the head direction cells found in the rodent brain. The results of our study suggest that the recorded signals originate from neurons. Conclusions We anticipate that our biologging system will facilitate a more detailed investigation into the neural underpinning of fish movement using internally generated information, including responses to external cues.

Еnactivist Criticism of the Neurobiological Theory of Consciousness

2021 ◽  
pp. 76-80
Author(s):  
Anastasia O. Shabalina ◽  
Keyword(s):  
Philosophy Of Mind ◽  
Point Of View ◽  
Science Methods ◽  
Neural Processes ◽  
Neural Substrate ◽  
Critical Revision ◽  
Concept Of Information ◽  
The Mind ◽  
The Brain ◽  
Person Experience

The article considers the main arguments against the neurobiological theory of consciousness from the point of view of the enactivist approach within the philosophy of mind. The neurobiological theory of consciousness, which reduces consciousness to neural activity, is currently the dominant approach to the mind-body problem. The neurobiological theory emerged as a result of advances in research on the phenomena of consciousness and through the development of technologies for visualizing the internal processes of mind. However, at the very heart of this theory, there is a number of logical contradictions. The non-reductive enactivist approach to consciousness, introduced in this article, contributes to the existing argumentation against the reduction of consciousness to neural processes with remonstrations that take into account the modern neuroscientific data. The article analyzes the argumentation of the sensorimotor enactivism developed by A. Noe and offers the account of the teleosemantic approach to the concept of information provided by R. Cao. The key problems of the neurobiological theory of consciousness are highlighted, and the objections emerging within the framework of the enactivist approach are analyzed. Since the main concepts on which the neural theory is based are the concepts of neural substrate, cognition as representation, and information as a unit of cognition, the author of the article presents three key enactivist ideas that oppose them. First, the enactivist concept of cognition as action allows us to consider the first-person experience as a mode of action, and not as a state of the brain substrate. Second, the article deals with the “explanatory externalism” argument proposed by Noe, who refutes the image of cognition as a representation in the brain. Finally, in order to critically revise the concept of information as a unit of cognition, the author analyzes Cao’s idea, which represents a teleosemantic approach, but is in line with the general enactivist argumentation. Cao shows that the application of the concept “information” to neural processes is problematic: no naturalized information is found in the brain as a physical substrate. A critical revision of beliefs associated with the neural theory of consciousness leads us to recognize that there are not enough grounds for reducing consciousness to processes that take place in the brain. That is why Noe calls expectations that the visualization of processes taking place in the brain with the help of the modern equipment will be able to depict the experience of consciousness the “new phrenology”, thus indicating the naive character of neural reduction. The article concludes that natural science methods are insufficient for the study of consciousness.

Songs to Syntax

2011 ◽  
Vol 5 (4) ◽  
pp. 22-32 ◽  
Author(s):  
Robert C. Berwick
Keyword(s):  
Auditory Perception ◽  
Convergent Evolution ◽  
Vocal Learning ◽  
Brain Regions ◽  
Auditory Memory ◽  
Central Component ◽  
Common Descent ◽  
Sensory Modalities ◽  
The Rich ◽  
The Brain

Language comprises a central component of a complex that is sometimes called “the human capacity.” This complex seems to have crystallized fairly recently among a small group in East Africa of whom people are all descendants. Common descent has been important in the evolution of the brain, such that avian and mammalian brains may be largely homologous, particularly in the case of brain regions involved in auditory perception, vocalization and auditory memory. There has been convergent evolution of the capacity for auditory-vocal learning, and possibly for structuring of external vocalizations, such that apes lack the abilities that are shared between songbirds and humans. Language’s recent evolutionary origin suggests that the computational machinery underlying syntax arose via the introduction of a single, simple, combinatorial operation. Further, the relation of a simple combinatorial syntax to the sensory-motor and thought systems reveals language to be asymmetric in design: while it precisely matches the representations required for inner mental thought, acting as the “glue” that binds together other internal cognitive and sensory modalities, at the same time it poses computational difficulties for externalization, that is, parsing and speech or signed production. Despite this mismatch, language syntax leads directly to the rich cognitive array that marks us as a symbolic species.

Brain stem responses to electrical stimulation of ventral vagal gastric fibers

1989 ◽  
Vol 257 (1) ◽  
pp. G24-G29
Author(s):  
W. D. Barber ◽  
C. S. Yuan
Keyword(s):  
Electrical Stimulation ◽  
Brain Stem ◽  
Time Of Arrival ◽  
Neuronal Responses ◽  
Proximal Stomach ◽  
Afferent Fibers ◽  
Sensory Modalities ◽  
The Mean ◽  
The Brain ◽  
Stimulation Of

The brain stem neuronal responses to electrical stimulation of gastric branches of the ventral vagal trunk serving the proximal stomach were localized and evaluated in anesthetized cats. The responses were equally distributed bilaterally in the region of nucleus solitarius in the caudal brain stem. The mean latency of the response was 289 +/- 46 (SD) ms, which translated into a conduction velocity of less than 1 m/s based on the distance between the stimulating and recording electrodes. The responses consisted of single and multiple spikes that showed slight variability in the latency, indicating orthodromic activation via a synapse in approximately 98% of the responses recorded. Forty two percent of the units tested showed evidence of convergence of input from vagal afferent fibers in different branches of the ventral vagal trunk that served the proximal stomach. The resultant activity pattern of the unitary response appeared to be the product of 1) the gastric sensory input or modality conveyed by the afferent source and 2) the time of arrival and diversity of modalities served by other gastric afferents impinging on the unit. This provides a mechanism capable of responding on the basis of specific sensory modalities that dynamically reflect ongoing events monitored and conveyed by other gastric afferents in the region.

Audiovisual crossmodal correspondences in Autism Spectrum Disorders (ASDs)

2012 ◽  
Vol 25 (0) ◽  
pp. 44
Author(s):  
Valeria Occelli ◽  
Gianluca Esposito ◽  
Paola Venuti ◽  
Peter Walker ◽  
Massimiliano Zampini
Keyword(s):  
Autism Spectrum ◽  
Crossmodal Correspondences ◽  
Association Pattern ◽  
Visual Patterns ◽  
Visual Inputs ◽  
Sensory Modalities ◽  
Crossmodal Correspondence ◽  
Matching Performance ◽  
Spectrum Disorders ◽  
Auditory Features

The label ‘crossmodal correspondences’ has been used to define the nonarbitrary associations that appear to exist between different basic physical stimulus attributes in different sensory modalities. For instance, it has been consistently shown in the neurotypical population that higher pitched sounds are more frequently matched with visual patterns which are brighter, smaller, and sharper than those associated to lower pitched sounds. Some evidence suggests that patients with ASDs tend not to show this crossmodal preferential association pattern (e.g., curvilinear shapes and labial/lingual consonants vs. rectilinear shapes and plosive consonants). In the present study, we compared the performance of children with ASDs (6–15 years) and matched neurotypical controls in a non-verbal crossmodal correspondence task. The participants were asked to indicate which of two bouncing visual patterns was making a centrally located sound. In intermixed trials, the visual patterns varied in either size, surface brightness, or shape, whereas the sound varied in pitch. The results showed that, whereas the neurotypical controls reliably matched the higher pitched sound to a smaller and brighter visual pattern, the performance of participants with ASDs was at chance level. In the condition where the visual patterns differed in shape, no inter-group difference was observed. Children’s matching performance cannot be attributed to intensity matching or difficulties in understanding the instructions, which were controlled. These data suggest that the tendency to associate congruent visual and auditory features vary as a function of the presence of ASDs, possibly pointing to poorer capabilities to integrate auditory and visual inputs in this population.

scholarly journals Interhemispheric control of sensory cue integration and self-motion perception

Neuroscience ◽  
2019 ◽  
Vol 408 ◽  
pp. 378-387 ◽  
Author(s):  
Qadeer Arshad ◽  
Marta Casanovas Ortega ◽  
Usman Goga ◽  
Rhannon Lobo ◽  
Shuaib Siddiqui ◽  
...  
Keyword(s):  
Motion Perception ◽  
Cue Integration ◽  
Sensory Cue ◽  
Self Motion

Difficulties with synaptic theory of learning and memory and possible remedies

2000 ◽  
Vol 23 (4) ◽  
pp. 550-551
Author(s):  
Mikhail N. Zhadin
Keyword(s):  
Cerebral Cortex ◽  
Associative Learning ◽  
Learning And Memory ◽  
Hebbian Learning ◽  
Behavioral Responses ◽  
Learning Rules ◽  
The Brain

The absence of a clear influence of an animal's behavioral responses to Hebbian associative learning in the cerebral cortex requires some changes in the Hebbian learning rules. The participation of the brain monoaminergic systems in Hebbian associative learning is considered.

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