arXiv subjects

Bartosz Jura

Publications and source records attributed to Bartosz Jura.

5 recordsLinked to original sources

arXiv2024

On the alternatives to the ideal mathematical points-like separatedness

In a recent paper as an alternative to models based on the notion of ideal mathematical point, characterized by a property of separatedness, we considered a viewpoint based on the notion of continuous change, making use of elements of a non-classical logic, in particular the fuzzy sets theory, with events represented as spatiotemporally blurred blobs. Here we point out and discuss a number of aspects of this imperfect symbolic description that might potentially be misleading. Besides that, we analyze its relation to various concepts used commonly to model physical systems, denoted by terms like: point, set, continuous, discrete, infinite, or local, clarifying further how our viewpoint is different and asking whether, in light of our main postulate, any of these notions, or their opposites, if exist, are in their usual meanings suitable to accurately describe the natural phenomena.

q-bio.NC↗

arXiv2023

Spatio-temporally graded causality: a model

In this paper we consider a claim that in the natural world there is no fact of the matter about the spatio-temporal separation of events. In order to make sense of such a notion and construct useful models of the world, it is proposed to use elements of a non-classical logic. Specifically, a model is proposed here, according to which causality can be considered to be spatio-temporally graded. It is outlined how this can be described using the formalism of fuzzy sets theory, with the degree of causality varying between 1, that is no separation between causes and effects, and 0, that is perfect separation between causes and their effects as in classical 'billiard balls' models of physical systems, namely such based on the notion of ideal mathematical point. Our model posits that subjective moments of time are like fuzzy sets, with their extension determined by local degrees of causality, resulting from information integration processes extended gradually in space and time. This, we argue, is how a notion of causality could be, to a certain degree, spared and reconciled with a variant of Bergsonian duration theory as formulated in the theory of continuous change. Relation of the proposed viewpoint to other theories, as well as possible solutions it suggests to various problems, in particular the measurement problem, are also discussed.

q-bio.NC↗

arXiv2023

Interpretability Benchmark for Evaluating Spatial Misalignment of Prototypical Parts Explanations

Prototypical parts-based networks are becoming increasingly popular due to their faithful self-explanations. However, their similarity maps are calculated in the penultimate network layer. Therefore, the receptive field of the prototype activation region often depends on parts of the image outside this region, which can lead to misleading interpretations. We name this undesired behavior a spatial explanation misalignment and introduce an interpretability benchmark with a set of dedicated metrics for quantifying this phenomenon. In addition, we propose a method for misalignment compensation and apply it to existing state-of-the-art models. We show the expressiveness of our benchmark and the effectiveness of the proposed compensation methodology through extensive empirical studies.

cs.CV↗

arXiv2022

Synaptic clock as a neural substrate of consciousness

In this theoretical work the temporal aspect of consciousness is analyzed. We start from the notion that while conscious experience seems to change constantly, yet for any of its contents to be consciously perceived they must last for some non-zero duration of time, which appears to constitute certain conflict. We posit that, in terms of phenomenological analysis of consciousness, the temporal aspect, and this apparent conflict in particular, might be the most basic property, likely inherent to any conceivable form of consciousness. It is then outlined how taking this perspective offers a concrete way of relating the properties of consciousness directly to the neural plasticity mechanisms of learning and memory, and specifying how exactly subjective experience might be related to processes of information integration. In particular, we propose synaptic clock to constitute a content-specific neural substrate of consciousness, explaining how it would correspond to this temporal aspect. Then, we propose a viewpoint, in which moments of subjective time have different durations, depending on the type of information processed, proportional to the time units of corresponding synaptic clocks, and being in principle different for different brain regions and nervous systems in different animal species. Relation and possible contributions of this viewpoint to the extensional model of time consciousness are discussed. Finally, we consider the two alternative views on the structure of consciousness, namely a static and a dynamic one, and argue in favor of the latter, proposing that consciousness can be best understood if change is considered its only dimension.

q-bio.NC↗

arXiv2018

A mechanism of synaptic clock underlying subjective time perception

Temporal resolution of visual information processing is thought to be an important factor in predator-prey interactions, shaped in the course of evolution by animals' ecology. Here I show that light can be considered to have a dual role of a source of information, which guides motor actions, and an environmental feedback for those actions. I consequently show how temporal perception might depend on behavioral adaptations realized by the nervous system. I propose an underlying mechanism of synaptic clock, with every synapse having its characteristic time unit, determined by the persistence of memory traces of synaptic inputs, which is used by the synapse to tell time. The present theory offers a testable framework, which may account for numerous experimental findings, including the interspecies variation in temporal resolution and the properties of subjective time perception, specifically the variable speed of perceived time passage, depending on emotional and attentional states or tasks performed.

q-bio.NC↗