Time-domain analysis for extracting fast-paced pupil responses

The eye pupil reacts to cognitive processes, but its analysis is challenging when luminance varies or when stimulation is fast-paced. Current approaches relying on deconvolution techniques do not account for the strong low-frequency spontaneous changes in pupil size or the large interindividual vari...

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Bibliographic Details
Published inScientific reports Vol. 7; no. 1; p. 41484
Main Author Zénon, Alexandre
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 30.01.2017
Nature Publishing Group
Subjects
631/378
631/553/1806
Adult
Algorithms
Arousal
Blinking
Cognitive ability
Data processing
Emotional behavior
Emotions
Eye
Female
Humanities and Social Sciences
Humans
Latency
Male
Models, Biological
multidisciplinary
Noise
Photic Stimulation
Physiology
Pupil - physiology
Reaction Time
Recording sessions
Reflex, Pupillary
Respiration
Science
Young Adult
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Summary:The eye pupil reacts to cognitive processes, but its analysis is challenging when luminance varies or when stimulation is fast-paced. Current approaches relying on deconvolution techniques do not account for the strong low-frequency spontaneous changes in pupil size or the large interindividual variability in the shape of the responses. Here a system identification framework is proposed in which the pupil responses to different parameters are extracted by means of an autoregressive model with exogenous inputs. In an example application of this technique, pupil size was shown to respond to the luminance and arousal scores of affective pictures presented in rapid succession. This result was significant in each subject ( N  = 5), but the pupil response varied between individuals both in amplitude and latency, highlighting the need for determining impulse responses subjectwise. The same method was also used to account for pupil size variations caused by respiration, illustrating the possibility to model the relation between pupil size and other continuous signals. In conclusion, this new framework for the analysis of pupil size data allows us to dissociate the response of the eye pupil from intermingled sources of influence and can be used to study the relation between pupil size and other physiological signals.
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ISSN:2045-2322
2045-2322
DOI:10.1038/srep41484