Journal Article

Time Adaptation Shows Duration Selectivity in the Human Parietal Cortex

Ditye, Thomas, Kanai, Ryota, Hashiguchi, Maho, Hayashi, Masamichi J., Walsh, Vincent, Sadato, Norihiro, Carlson, Synnöve, Harada, Tokiko

2015

Overview

Although psychological and computational models of time estimation have postulated the existence of neural representations tuned for specific durations, empirical evidence of this notion has been lacking. Here, using a functional magnetic resonance imaging (fMRI) adaptation paradigm, we show that the inferior parietal lobule (IPL) (corresponding to the supramarginal gyrus) exhibited reduction in neural activity due to adaptation when a visual stimulus of the same duration was repeatedly presented. Adaptation was strongest when stimuli of identical durations were repeated, and it gradually decreased as the difference between the reference and test durations increased. This tuning property generalized across a broad range of durations, indicating the presence of general time-representation mechanisms in the IPL. Furthermore, adaptation was observed irrespective of the subject's attention to time. Repetition of a nontemporal aspect of the stimulus (i.e., shape) did not produce neural adaptation in the IPL. These results provide neural evidence for duration-tuned representations in the human brain.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Adaptation, Physiological / Adolescent / Adult / Brain research / Discrimination (Psychology) / Experiments / Female / Healthy Volunteers / Humans / Magnetic Resonance Imaging / Male / Methods / NMR / Nuclear magnetic resonance / Parietal Lobe - physiology / Physiological aspects / Prefrontal cortex / Studies / Temporal Lobe - physiology / Time Perception - physiology / Young Adult