A threshold-free model of numerosity comparisons.
Santiago Alonso-Diaz1, Jessica F Cantlon1, Steven T Piantadosi1
1Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY, United States of America.
Plos One
|April 6, 2018
Summary
This study presents a threshold-free model for decision-making, suggesting continuous information processing during motor responses. The model accurately predicts behavior in number comparison tasks without a decision boundary.
Area of Science:
- Cognitive Neuroscience
- Decision Neuroscience
- Motor Control
Background:
- Traditional models posit decision thresholds before motor responses.
- Recent findings suggest continuous processing beyond decision boundaries, including spatial gradients and changes-of-mind.
- Existing models struggle to explain these dynamic aspects of decision-making and action execution.
Purpose of the Study:
- To propose and validate a formal, threshold-free model of decision-making.
- To explain detailed behavioral effects, including reaction time and accuracy, without a fixed decision threshold.
- To integrate cognitive decision processes with motor planning and execution.
Main Methods:
- Development of a formal threshold-free computational model.
- Utilizing a number comparison task to gather behavioral data.
- Statistical inference and biomechanical feedback control principles were applied.
Main Results:
- The threshold-free model successfully reproduced key behavioral data, including sensitivity to numerical distance.
- Model accurately predicted reaction times, accuracy, and the occurrence of changes-of-mind.
- Demonstrated that continuous motor planning can account for observed decision dynamics.
Conclusions:
- Decision-making and action execution may not rely on a strict threshold.
- A continuous motor planner with statistical inference offers a parsimonious explanation for complex decision behaviors.
- This framework advances understanding of the interplay between cognitive and motor systems in decision-making.
Related Concept Videos
01:26Pharmacokinetic Models: Comparison and Selection Criterion
369
Physiological and compartmental models are valuable tools used in studying biological systems. These models rely on differential equations to maintain mass balance within the system, ensuring an accurate representation of the dynamic processes at play.
Physiological models take a detailed approach by considering specific molecular processes. They can predict drug distribution, metabolism, and elimination changes, providing a comprehensive understanding of how drugs interact with the body.
Physiological models take a detailed approach by considering specific molecular processes. They can predict drug distribution, metabolism, and elimination changes, providing a comprehensive understanding of how drugs interact with the body.
369
02:57The Sense of Self: Reflected Self-Appraisal and Social Comparison
56.1K
According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
56.1K
01:13Multiple Comparison Tests
4.5K
Multiple comparison test, abbreviated as MCT, is a post hoc analysis generally performed after comparing multiple samples with one or more tests. An MCT will help identify a significantly different sample among multiple samples or a factor among multiple factors.
It would be easy to compare two samples using a significance alpha level of 0.05. In other words, there is only one sample pair to be compared. However, it would be difficult to identify a significantly different sample if the number...
It would be easy to compare two samples using a significance alpha level of 0.05. In other words, there is only one sample pair to be compared. However, it would be difficult to identify a significantly different sample if the number...
4.5K
02:54Evolutionary Relationships through Genome Comparisons
7.1K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
7.1K
01:24Comparison Between Electrical And Gravitational Forces
4.1K
There are four fundamental forces in nature: the gravitational force, the electromagnetic force, the strong nuclear force, and the weak nuclear force. To compare the numerical strengths of the first two, take two particles of the same kind. Since electrons are fundamental particles, they are a good example.
Since both are inverse square law forces, the distance gets canceled when the ratio of the two forces is considered. Instead, the ratio of the electrical and gravitational forces depends on...
Since both are inverse square law forces, the distance gets canceled when the ratio of the two forces is considered. Instead, the ratio of the electrical and gravitational forces depends on...
4.1K
01:24Comparison between RL and RC circuits
6.2K
An RC circuit consists of resistance and capacitance, while in an RL circuit, capacitance is replaced by an inductor. RL and RC circuits are first-order differential circuits that store energy. An RC circuit stores energy in the electric field, while an RL circuit stores energy in the magnetic field. When connected to a battery, an RC circuit charges the capacitor, causing the current to decrease from maximum to zero upon being fully charged. This increases the voltage across the capacitor from...
6.2K