Feel the Noise: Relating Individual Differences in Auditory Imagery to the Structure and Function of Sensorimotor Systems.
Cereb Cortex
; 25(11): 4638-50, 2015 Nov.
Article
de En
| MEDLINE
| ID: mdl-26092220
ABSTRACT
Humans can generate mental auditory images of voices or songs, sometimes perceiving them almost as vividly as perceptual experiences. The functional networks supporting auditory imagery have been described, but less is known about the systems associated with interindividual differences in auditory imagery. Combining voxel-based morphometry and fMRI, we examined the structural basis of interindividual differences in how auditory images are subjectively perceived, and explored associations between auditory imagery, sensory-based processing, and visual imagery. Vividness of auditory imagery correlated with gray matter volume in the supplementary motor area (SMA), parietal cortex, medial superior frontal gyrus, and middle frontal gyrus. An analysis of functional responses to different types of human vocalizations revealed that the SMA and parietal sites that predict imagery are also modulated by sound type. Using representational similarity analysis, we found that higher representational specificity of heard sounds in SMA predicts vividness of imagery, indicating a mechanistic link between sensory- and imagery-based processing in sensorimotor cortex. Vividness of imagery in the visual domain also correlated with SMA structure, and with auditory imagery scores. Altogether, these findings provide evidence for a signature of imagery in brain structure, and highlight a common role of perceptual-motor interactions for processing heard and internally generated auditory information.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Perception auditive
/
Cortex cérébral
/
Imagination
/
Individualité
/
Bruit
Type d'étude:
Diagnostic_studies
/
Prognostic_studies
Limites:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Male
/
Middle aged
Langue:
En
Journal:
Cereb Cortex
Sujet du journal:
CEREBRO
Année:
2015
Type de document:
Article
Pays d'affiliation:
Portugal