Ocular accommodation and cognitive demand: an additional indicator besides pupil size and cardiovascular measures?

Journal of Negative Results in Biomedicine
Stephanie JaintaWolfgang Jaschinski

Abstract

The aim of the present study was to assess accommodation as a possible indicator of changes in the autonomic balance caused by altered cognitive demand. Accounting for accommodative responses from a human factors perspective may be motivated by the interest of designing virtual image displays or by establishing an autonomic indicator that allows for remote measurement at the human eye. Heart period, pulse transit time, and the pupillary response were considered as reference for possible closed-loop accommodative effects. Cognitive demand was varied by presenting monocularly numbers at a viewing distance of 5 D (20 cm) which had to be read, added or multiplied; further, letters were presented in a "n-back" task. Cardiovascular parameters and pupil size indicated a change in autonomic balance, while error rates and reaction time confirmed the increased cognitive demand during task processing. An observed decrease in accommodation could not be attributed to the cognitive demand itself for two reasons: (1) the cognitive demand induced a shift in gaze direction which, for methodological reasons, accounted for a substantial part of the observed accommodative changes. (2) Remaining effects disappeared when the correctness of task proc...Continue Reading

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Citations

May 6, 2020·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Beatriz RedondoRaimundo Jiménez
Sep 6, 2018·Vision·Niall J HynesEdward A H Mallen
Feb 14, 2021·Biological Psychology·L KooijmanJ C F de Winter

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