SVM directed machine learning classifier for human action recognition network

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Jan. 3, 2025

Understanding human behavior and action recognition are both essential components of effective surveillance video analysis for the purpose guaranteeing public safety. However, existing approaches such as three-dimensional convolutional neural networks (3D CNN) two-stream (2SNN) have computational hurdles due to significant parameterization they require. In this paper, we offer HARNet, a specialized lightweight residual 3D CNN that is built on directed acyclic graphs was created expressly handle these issues achieve detection. The suggested method presents an innovative pipeline creating spatial motion data from raw inputs, which makes successful latent representation learning motions easier accomplish. This generated input then supplied into processes information in single stream manner, maximizing benefits types cues. use traditional machine classifiers done order further improve discriminative capacity features been learned. To be more specific, representations stored HARNet's fully connected layer them our deep learnt features. After that, entered Support Vector Machine (SVM) classifier accomplish recognition. evaluate HARNet-SVM developed, empirical tests were run commonly used datasets UCF101, HMDB51, KTH dataset. These carried out gather evaluation. experimental results show superior other state-of-the-art approaches, achieving considerable performance increases 2.75% 10.94% 0.18% obtained by running each dataset separately. Our findings demonstrate usefulness design highlight significance utilizing SVM with accurate computationally efficient activity videos. work helps advancement technology, turn applications take place real world safer dependable.

Language: Английский

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Brainstem circuits encoding start, speed, and duration of swimming in adult zebrafish

Neuron, Journal Year: 2022, Volume and Issue: 111(3), P. 372 - 386.e4

Published: Nov. 21, 2022

The flexibility of locomotor movements requires an accurate control their start, duration, and speed. How brainstem circuits encode convey these parameters remains unclear. Here, we have combined in vivo calcium imaging, electrophysiology, anatomy, behavior adult zebrafish to address questions. We reveal that the detailed are encoded by two molecularly, topographically, functionally segregated glutamatergic neuron subpopulations within nucleus medial longitudinal fasciculus. changes locomotion speed vGlut2+ neurons, whereas vGlut1+ neurons sudden high speed/high amplitude movements. Ablation compromised slow-explorative swimming, ablation impaired fast swimming. Our results provide mechanistic insights into how separate implement flexible commands. These command suitably organized integrate environmental cues hence generate swimming match animal's behavioral needs.

Language: Английский

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Modular circuit organization for speed control of locomotor movements

Current Opinion in Neurobiology, Journal Year: 2023, Volume and Issue: 82, P. 102760 - 102760

Published: Aug. 17, 2023

Language: Английский

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Complexity of modular neuromuscular control increases and variability decreases during human locomotor development

Communications Biology, Journal Year: 2022, Volume and Issue: 5(1)

Published: Nov. 16, 2022

Abstract When does modular control of locomotion emerge during human development? One view is that modularity not innate, being learnt over several months experience. Alternatively, the basic motor modules are present at birth, but subsequently reconfigured due to changing brain-body-environment interactions. problem in identifying structures stepping infants presence noise. Here, using both simulated and experimental muscle activity data from neonates, infants, preschoolers, adults, we dissect influence noise, identify all individuals, including neonates. Complexity increases neonatal stage adulthood multiple levels infrastructure, intrinsic rhythmicity measured level individual muscles activities, synergies bilateral intermuscular network connectivity. Low complexity high variability neuromuscular signals attest immaturity, they also involve potential benefits for learning locomotor tasks.

Language: Английский

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Degenerate Neuronal and Circuit Mechanisms Important for Generating Rhythmic Motor Patterns

Physiological Reviews, Journal Year: 2024, Volume and Issue: 105(1), P. 95 - 135

Published: June 13, 2024

In 1996, we published a review article (Marder E, Calabrese RL.

Language: Английский

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Neuroprotective gap-junction-mediated bystander transformations in the adult zebrafish spinal cord after injury

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: May 21, 2024

Abstract The adult zebrafish spinal cord displays an impressive innate ability to regenerate after traumatic insults, yet the underlying adaptive cellular mechanisms remain elusive. Here, we show that while and tissue responses injury are largely conserved among vertebrates, large-size fast motoneurons remarkably resilient by remaining viable functional. We also reveal dynamic changes in motoneuron glutamatergic input, excitability, calcium signaling, underscore critical role of calretinin (CR) binding buffering intracellular injury. Importantly, demonstrate presence dynamics a neuron-to-neuron bystander neuroprotective biochemical cooperation mediated through gap junction channels. Our findings support model which intimate interplay between glutamate buffering, channels, intercellular upholds cell survival promotes initiation regeneration.

Language: Английский

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Unique advantages of zebrafish larvae as a model for spinal cord regeneration

Frontiers in Molecular Neuroscience, Journal Year: 2022, Volume and Issue: 15

Published: Sept. 7, 2022

The regenerative capacity of the spinal cord in mammals ends at birth. In contrast, teleost fish and amphibians retain this throughout life, leading to use powerful zebrafish model system identify novel mechanisms that promote regeneration. While adult offer an effective comparison with non-regenerating mammals, they lack complete array experimental approaches have made animal so successful. optical transparency, simple anatomy complex behavior larvae, combined known conservation pro-regenerative signals cell types between larval stages, suggest may hold even more promise as a for investigating review, we highlight characteristics advantages underlie its potential provide future therapeutic treating human injury.

Language: Английский

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Mixed synapses reconcile violations of the size principle in zebrafish spinal cord

eLife, Journal Year: 2022, Volume and Issue: 11

Published: Sept. 27, 2022

Mixed electrical-chemical synapses potentially complicate electrophysiological interpretations of neuronal excitability and connectivity. Here, we disentangle the impact mixed within spinal locomotor circuitry larval zebrafish. We demonstrate that soma size is not linked to input resistance for interneurons, contrary biophysical predictions ‘size principle’ motor neurons. Next, show time constants are faster, excitatory currents stronger, potentials larger in lower neurons, linking synapse density resting excitability. Using a computational model, verify weighted electrical on membrane properties, synaptic integration low-pass filtering distribution coupling potentials. conclude differences can contribute underestimations connectivity overestimations. The contribution inputs helps explain ‘violations’ principle, where neuron size, recruitment order unrelated.

Language: Английский

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Spinal Basis of Direction Control during Locomotion in Larval Zebrafish

Journal of Neuroscience, Journal Year: 2023, Volume and Issue: 43(22), P. 4062 - 4074

Published: May 1, 2023

Navigation requires steering and propulsion, but how spinal circuits contribute to direction control during ongoing locomotion is not well understood. Here, we use drifting vertical gratings evoke directed "fictive" swimming in intact immobilized larval zebrafish while performing electrophysiological recordings from neurons. We find that involves unilateral changes the duration of motor output increased recruitment neurons, without impacting timing spiking across or along body. Voltage-clamp neurons reveal increases phasic excitation inhibition on side turn. Current-clamp premotor interneurons provide two types patterns. A direction-agnostic pattern with balanced turning nonturning sides primarily observed excitatory V2a ipsilateral descending axons, a direction-sensitive preferential dominated by bifurcating axons. Inhibitory V1 are also divided into subsets, although there no detectable morphologic distinction. Our findings support modular propulsion circuits, where distinct subsets inhibitory adjustments move.SIGNIFICANCE STATEMENT Spinal play an essential role coordinating movements locomotion. However, it unclear they participate do interfere coordination. Here have developed system using allows us directly record electrical signals guided visual cues. for coordination others drive asymmetries neuron control. suggest organization enables uninterrupted

Language: Английский

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Single-cell RNAseq analysis of spinal locomotor circuitry in larval zebrafish

eLife, Journal Year: 2023, Volume and Issue: 12

Published: July 25, 2023

Identification of the neuronal types that form specialized circuits controlling distinct behaviors has benefited greatly from simplicity offered by zebrafish. Electrophysiological studies have shown in addition to connectivity, understanding circuitry requires identification functional specializations among individual circuit components, such as those regulate levels transmitter release and excitability. In this study, we use single-cell RNA sequencing (scRNAseq) identify molecular bases for distinctions between motoneuron are causal their differential roles swimming. The primary motoneuron, particular, expresses high a unique combination voltage-dependent ion channel synaptic proteins termed 'cassettes.' promoting high-frequency firing action potentials augmented at neuromuscular junction, both contributing greater power generation. Our transcriptional profiling spinal neurons further assigns expression cassette specific interneuron also involved central high-speed swimming escape behaviors. analysis highlights utility scRNAseq characterization circuitry, providing gene resource studying cell type diversity.

Language: Английский

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