Interaction of numerosity and time in prefrontal and parietal cortex
Masamichi J Hayashi1, Ryota Kanai, Hiroki C Tanabe
1Institute of Biomedicine, Physiology, University of Helsinki, Helsinki 00014, Finland. mjhgml@gmail.com
Summary
The brain
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Human Brain Function
Background:
- Magnitude systems for numerical and temporal information may overlap.
- Neural basis of cross-domain magnitude interactions remains unclear.
- Investigating perception and decision-making levels of interaction.
Purpose of the Study:
- Identify neural correlates of numerosity-time interactions.
- Differentiate roles of right intraparietal cortex (IPC) and inferior frontal gyrus (IFG).
- Clarify involvement in perception versus decision-making.
Main Methods:
- Functional magnetic resonance imaging (fMRI) in humans.
- Transcranial magnetic stimulation (TMS) to probe causality.
- Numerosity-time interaction tasks (duration discrimination, time reproduction).
Main Results:
- Right IPC and IFG jointly activated by numerosity and duration tasks.
- Right IFG shows congruency effect; TMS impairs categorical discrimination.
- Right IPC modulates numerosity's influence on time perception; TMS impairs precise estimation.
Conclusions:
- Right IFG involved in categorical decision-making stage.
- Right IPC involved in perceptual-level interaction and time estimation.
- Propose two-stage model: parietal for perception, prefrontal for decisions.
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