The left intraparietal sulcus adapts to symbolic number in both the visual and auditory modalities: Evidence from fMRI.
A growing body of evidence from functional Magnetic Resonance Imaging adaptation (fMRIa) has implicated the left intraparietal sulcus (IPS) as a crucial brain region representing the semantic of number symbols. However, it is currently unknown to what extent the left IPS brain activity can be generalized across modalities (e.g., Arabic digits and spoken number words) and how robust and reproducible numerical adaptation effects are. In two separate fMRIa experiments we habituated the brain response of 20 native English-speaking (Experiment 1) and 34 native German-speaking (Experiment 2) adults to Arabic digits or spoken number words. Consistent with previous findings, experiment 1 revealed numerical ratio dependent adaptation to Arabic numerals in the left IPS using both conventional and cortex-based alignment techniques. Experiment 2 revealed numerical ratio dependent signal recovery in the left IPS following adaptation to both Arabic numerals and spoken number words using both conventional and cortex-based alignment techniques. Together, these findings suggest that the left IPS is involved in symbolic number processing across modalities.
Educational Neuroscience, Institute of Psychology, University of Graz, Austria; Numerical Cognition Laboratory, Department of Psychology & Brain and Mind Institute, The University of Western Ontario, Canada. Electronic address: stephan.vogel@uni-graz.at.
Stephan E
SE
Vogel
Numerical Cognition Laboratory, Department of Psychology & Brain and Mind Institute, The University of Western Ontario, Canada.
Celia
C
Goffin
Department of Psychology, Georg-August-University Goettingen, Germany.
Joshua
J
Bohnenberger
Institute of Psychology, University of Graz, Austria.
Karl
K
Koschutnig
Department of Radiology, Division of Neuroradiology, Vascular and Interventional Radiology, Medical University of Graz, Austria.
Gernot
G
Reishofer
Educational Neuroscience, Institute of Psychology, University of Graz, Austria.
Roland H
RH
Grabner
Numerical Cognition Laboratory, Department of Psychology & Brain and Mind Institute, The University of Western Ontario, Canada.
Daniel
D
Ansari
D000161:Acoustic Stimulation; D000222:Adaptation, Physiological; D000328:Adult; D001931:Brain Mapping; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010296:Parietal Lobe / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation; D012660:Semantics; D013067:Speech Perception / Q000502:physiology; D055815:Young Adult
Arabic numerals; Intraparietal sulcus (IPS); Number representation; Number words; Numerical ratio; fMRI adaptation