A sensory integration account for time perception

Alessandro Toso, Arash Fassihi, Luciano Paz, Francesca Pulecchi, Mathew E. Diamond, Samuel J. Gershman
2021 PLoS Computational Biology  
The connection between stimulus perception and time perception remains unknown. The present study combines human and rat psychophysics with sensory cortical neuronal firing to construct a computational model for the percept of elapsed time embedded within sense of touch. When subjects judged the duration of a vibration applied to the fingertip (human) or whiskers (rat), increasing stimulus intensity led to increasing perceived duration. Symmetrically, increasing vibration duration led to
more » ... ing perceived intensity. We modeled real spike trains recorded from vibrissal somatosensory cortex as input to dual leaky integrators–an intensity integrator with short time constant and a duration integrator with long time constant–generating neurometric functions that replicated the actual psychophysical functions of rats. Returning to human psychophysics, we then confirmed specific predictions of the dual leaky integrator model. This study offers a framework, based on sensory coding and subsequent accumulation of sensory drive, to account for how a feeling of the passage of time accompanies the tactile sensory experience.
doi:10.1371/journal.pcbi.1008668 pmid:33513135 fatcat:46pdhyxainaubkqj5znwynv5fa