Related Experiment Video
Updated: Jan 27, 2026
09:13
A Vibrotactile Feedback Device for Seated Balance Assessment and Training
Published on: January 20, 2019
6.8K
Neural mechanisms of vibrotactile categorization
Patrick S Malone1, Silvio P Eberhardt2, Klaus Wimmer3,4,5
1Department of Neuroscience, Georgetown University Medical Center, Washington, District of Columbia.
Human Brain Mapping
|March 29, 2019
Summary
This study shows that the brain categorizes touch, like vision and sound, using a two-stage process. This finding suggests a unified theory for how we perceive the world through different senses.
Area of Science:
- Neuroscience
- Cognitive Science
- Sensory Processing
Background:
- Perceptual categorization is crucial for cognition.
- A two-stage model (bottom-up feature detection, top-down categorization) is established for visual and auditory systems.
- The applicability of this model to the somatosensory system remained unclear.
Purpose of the Study:
- To investigate if a two-stage processing hierarchy underlies somatosensory perceptual categorization.
- To test the hypothesis using vibrotactile stimuli.
Main Methods:
- Functional magnetic resonance imaging (fMRI) in 14 human participants.
- Participants trained to categorize vibrotactile stimuli on their forearm.
- Representational similarity analysis and functional connectivity estimation.
Main Results:
- Stimulus selectivity identified in somatosensory and association cortices (e.g., precentral, postcentral gyri).
- A distinct category-selective region found in the left ventral precentral gyrus.
- Evidence for top-down functional connectivity from higher-order to sensory areas.
Conclusions:
- The findings support a two-stage model for somatosensory perceptual categorization.
- Suggests common computational principles across sensory modalities.
- Supports a unified theory of perceptual categorization.
More Related Videos
Related Concept Videos
01:11How Data are Classified: Categorical Data
43.3K
A variable, usually notated by capital letters such as X and Y, is a characteristic or measurement that can be determined for each member of a population. Data are the actual values of variables. They may be numbers, or they may be words. Datum is a single value.
Data are classified based on whether they are measurable or not. Categorical data cannot be measured; instead, it can be divided into categories. For example, if Y denotes a person's party affiliation, some examples of Y include...
Data are classified based on whether they are measurable or not. Categorical data cannot be measured; instead, it can be divided into categories. For example, if Y denotes a person's party affiliation, some examples of Y include...
43.3K
01:37Neural Regulation
43.3K
Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
43.3K
03:06Reaction Mechanisms
30.6K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
30.6K
01:58Mechanical Protein Functions
5.5K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
5.5K
01:25Neural Circuits
2.7K
Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
2.7K
01:19Mechanism of Conjugation
1.0K
Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
1.0K