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Related Experiment Video

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A Method to Study Adaptation to Left-Right Reversed Audition

A Method to Study Adaptation to Left-Right Reversed Audition

Published on: October 29, 2018

Effects of adaptation on numerosity decoding in the human brain.

E Castaldi¹, D Aagten-Murphy², M Tosetti³

¹Department of Translational Research on New Technologies in Medicine and Surgery, University of Pisa, Italy.

|September 14, 2016

Summary

Numerosity, the sense of number, adapts like other senses. This study shows adaptation directly impacts the brain's intraparietal sulcus (IPS), improving number discrimination.

Keywords:

Adaptation Multivariate decoding Number perception Parietal cortex fMRI

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Area of Science:

Cognitive Neuroscience
Sensory Perception

Background:

Numerosity is a sensory attribute subject to adaptation.
Neuroimaging studies indicate the intra-parietal sulcus (IPS) is involved in numerosity discrimination for low numbers.

Purpose of the Study:

To investigate the neural mechanisms of numerosity adaptation using a novel rapid adaptation paradigm.
To determine if adaptation affects the brain's representation of numerosity in the IPS.

Main Methods:

Developed a rapid adaptation paradigm with separated stimuli to dissociate BOLD activity.
Utilized multivariate pattern recognition (support vector machine) to classify brain activity related to numerosity (20-80).
Tested brain activity before and after adaptation to high numerosity.

Main Results:

Adaptation led to underestimation of lower numerosities and decreased BOLD responses in V1 and IPS.
IPS, but not V1, showed robust numerosity classification both before and after adaptation.
Decoding accuracy improved post-adaptation, correlating with perceptual underestimation.

Conclusions:

Numerosity adaptation directly modulates neural representations in the IPS.
Adaptation enhances the brain's capacity for numerosity discrimination.
The findings suggest adaptation in IPS is specific to numerosity processing.