Correlated P300b and phasic pupil‐dilation responses to motivationally significant stimuli

Author:

Menicucci Danilo1ORCID,Animali Silvia1,Malloggi Eleonora2,Gemignani Angelo1,Bonanni Enrica3,Fornai Francesco2,Giorgi Filippo Sean2,Binda Paola2

Affiliation:

1. Department of Surgical, Medical and Molecular Pathology and Critical Care Medicine University of Pisa Pisa Italy

2. Department of Translational Research and New Technologies in Medicine and Surgery University of Pisa Pisa Italy

3. Department of Clinical and Experimental Medicine University of Pisa Pisa Italy

Abstract

AbstractMotivationally significant events like oddball stimuli elicit both a characteristic event‐related potential (ERPs) known as P300 and a set of autonomic responses including a phasic pupil dilation. Although co‐occurring, P300 and pupil‐dilation responses to oddball events have been repeatedly found to be uncorrelated, suggesting separate origins. We re‐examined their relationship in the context of a three‐stimulus version of the auditory oddball task, independently manipulating the frequency (rare vs. repeated) and motivational significance (relevance for the participant's task) of the stimuli. We used independent component analysis to derive a P300b component from EEG traces and linear modeling to separate a stimulus‐related pupil‐dilation response from a potentially confounding action‐related response. These steps revealed that, once the complexity of ERP and pupil‐dilation responses to oddball targets is accounted for, the amplitude of phasic pupil dilations and P300b are tightly and positively correlated (across participants: r = .69 p = .002), supporting their coordinated generation.

Publisher

Wiley

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