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Integrating Somatosensory Information Over Time
Raúl Hernández-Pérez1, Eduardo Rojas-Hortelano1, Victor de Lafuente1
1Institute of Neurobiology, National Autonomous University of Mexico. Boulevard Juriquilla 3001, Querétaro, QRO 76230, Mexico.
Neuroscience
|March 6, 2020
Summary
Our sense of touch integrates information over time, similar to sight and sound. The brain uses the first 600 milliseconds of tactile input for decisions, benefiting from longer sensory streams.
Area of Science:
- Neuroscience
- Psychology
- Human Sensory Perception
Background:
- Decision-making relies on integrating sensory information over time.
- Temporal integration is well-studied in visual and auditory systems.
- Tactile information integration over time remains less understood.
Purpose of the Study:
- To investigate how tactile information is integrated over time during an active touch task.
- To determine the time window of sensory evidence used for tactile decisions.
- To compare sensory accumulation models for tactile exploration.
Main Methods:
- Participants performed an active touch task, determining object inclination.
- A time-controlled paradigm manipulated exploration time.
- Behavioral data were analyzed using bounded accumulation and independent sampling models.
Main Results:
- Decision errors and times increased with smaller inclination angles (more difficult decisions).
- Model fits favored a bounded accumulation mechanism over independent sampling.
- Participants integrated tactile information for the initial 600 ms of 1800 ms stimuli.
Conclusions:
- The somatosensory system utilizes a temporal integration process for decision-making.
- Evidence accumulation up to a decision boundary explains tactile exploration behavior.
- The brain effectively uses a portion of available tactile information, not all of it.
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