scholarly journals Pairwise Probabilistic Clustering Using Evidence Accumulation

2010 ◽  
pp. 395-404 ◽  
Author(s):  
Samuel Rota Bulò ◽  
André Lourenço ◽  
Ana Fred ◽  
Marcello Pelillo
Keyword(s):  
Probabilistic Clustering ◽  
Evidence Accumulation

Sensory evidence integration and action initiation occur in parallel during perceptual decisions

2020 ◽  
Author(s):  
Lluís Hernández-Navarro ◽  
Ainhoa Hermoso-Mendizabal ◽  
Daniel Duque ◽  
Alexandre Hyafil ◽  
Jaime de la Rocha
Keyword(s):  
Time Pressure ◽  
Reaction Times ◽  
Stimulus Presentation ◽  
Perceptual Decision Making ◽  
Evidence Accumulation ◽  
Action Preparation ◽  
Action Model ◽  
The Brain ◽  
Evidence Integration ◽  
Action Initiation

It is commonly assumed that, during perceptual decisions, the brain integrates stimulus evidence until reaching a decision, and then performs the response. There are conditions, however (e.g. time pressure), in which the initiation of the response must be prepared in anticipation of the stimulus presentation. It is therefore not clear when the timing and the choice of perceptual responses depend exclusively on evidence accumulation, or when preparatory motor signals may interfere with this process. Here, we find that, in a free reaction time auditory discrimination task in rats, the timing of fast responses does not depend on the stimulus, although the choices do, suggesting a decoupling of the mechanisms of action initiation and choice selection. This behavior is captured by a novel model, the Parallel Sensory Integration and Action Model (PSIAM), in which response execution is triggered whenever one of two processes, Action Initiation or Evidence Accumulation, reaches a bound, while choice category is always set by the latter. Based on this separation, the model accurately predicts the distribution of reaction times when the stimulus is omitted, advanced or delayed. Furthermore, we show that changes in Action Initiation mediates both post-error slowing and a gradual slowing of the responses within each session. Overall, these results extend the standard models of perceptual decision-making, and shed a new light on the interaction between action preparation and evidence accumulation.

Evidence Accumulation for Spatial Reasoning.

1984 ◽  
Author(s):  
T. Matsuyama ◽  
V. S. S. Hwang ◽  
L. S. Davis
Keyword(s):  
Spatial Reasoning ◽  
Evidence Accumulation

scholarly journals Evidence accumulation relates to perceptual consciousness and monitoring

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Michael Pereira ◽  
Pierre Megevand ◽  
Mi Xue Tan ◽  
Wenwen Chang ◽  
Shuo Wang ◽  
...  
Keyword(s):  
Posterior Parietal Cortex ◽  
Detection Threshold ◽  
Task Demands ◽  
Neuron Activity ◽  
Neural Responses ◽  
Neuronal Responses ◽  
Neural Basis ◽  
Perceptual Consciousness ◽  
Evidence Accumulation ◽  
Posterior Parietal

AbstractA fundamental scientific question concerns the neural basis of perceptual consciousness and perceptual monitoring resulting from the processing of sensory events. Although recent studies identified neurons reflecting stimulus visibility, their functional role remains unknown. Here, we show that perceptual consciousness and monitoring involve evidence accumulation. We recorded single-neuron activity in a participant with a microelectrode in the posterior parietal cortex, while they detected vibrotactile stimuli around detection threshold and provided confidence estimates. We find that detected stimuli elicited neuronal responses resembling evidence accumulation during decision-making, irrespective of motor confounds or task demands. We generalize these findings in healthy volunteers using electroencephalography. Behavioral and neural responses are reproduced with a computational model considering a stimulus as detected if accumulated evidence reaches a bound, and confidence as the distance between maximal evidence and that bound. We conclude that gradual changes in neuronal dynamics during evidence accumulation relates to perceptual consciousness and perceptual monitoring in humans.

A Neural Index of Inefficient Evidence Accumulation in Dyslexia Underlying Slow Perceptual Decision Making

Cortex ◽  
2021 ◽  
Author(s):  
Nicole R. Stefanac ◽  
Shou-Han Zhou ◽  
Megan M. Spencer-Smith ◽  
Redmond O’Connell ◽  
Mark A. Bellgrove
Keyword(s):  
Decision Making ◽  
Perceptual Decision Making ◽  
Perceptual Decision ◽  
Evidence Accumulation

Probabilistic consensus clustering using evidence accumulation

2013 ◽  
Vol 98 (1-2) ◽  
pp. 331-357 ◽  
Author(s):  
André Lourenço ◽  
Samuel Rota Bulò ◽  
Nicola Rebagliati ◽  
Ana L. N. Fred ◽  
Mário A. T. Figueiredo ◽  
...  
Keyword(s):  
Consensus Clustering ◽  
Evidence Accumulation

scholarly journals Accurate single nucleotide variant detection in viral populations by combining probabilistic clustering with a statistical test of strand bias

BMC Genomics ◽  
2013 ◽  
Vol 14 (1) ◽  
pp. 501 ◽  
Author(s):  
Kerensa McElroy ◽  
Osvaldo Zagordi ◽  
Rowena Bull ◽  
Fabio Luciani ◽  
Niko Beerenwinkel
Keyword(s):  
Statistical Test ◽  
Single Nucleotide Variant ◽  
Strand Bias ◽  
Single Nucleotide ◽  
Probabilistic Clustering ◽  
Variant Detection
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