Pupil dilation is regulated autonomically and it may be a valid measure of pain, but pupillometry for pain intensity recordings has not been evaluated under different luminance conditions. We hypothesized that the pupil response may serve as an objective indicator of pain intensity even if luminance conditions differ which is often the case in experiments with pictures. In 20 healthy females we applied a tonic pressure pain to the fingers (20 s). During pain induction, participants looked at pictures of three different levels of luminance. Pupil dilation was recorded continuously. Immediately after pain onset, there was a significant pupil dilation which reached its maximum about 2 s after pain onset. While this maximum pupil dilation did not differ with pressure intensity, the pupil dilation was larger for the higher pressure intensity in the period from 10 s after pressure onset to pressure offset. Even under different luminance conditions, pupillometry can serve as an objective indicator of pressure pain intensity. Thus, it seems promising to use pupillometry with complex experimental designs combining pain and pictorial stimuli.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ijpsycho.2008.06.008 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Quantitative comparison of a mobile, tablet-based eye-tracker and two stationary, video-based eye-trackers.
Behav Res Methods
January 2025
Department Neurophysics, Philipps-Universität Marburg, Fachbereich Physik, AG Neurophysik, Karl-Von-Frisch-Straße 8a, 35043, Marburg, Lahnberge, Germany.
The analysis of eye movements is a noninvasive, reliable and fast method to detect and quantify brain (dys)function. Here, we investigated the performance of two novel eye-trackers-the Thomas Oculus Motus-research mobile (TOM-rm) and the TOM-research stationary (TOM-rs)-and compared them with the performance of a well-established video-based eye-tracker, i.e.
View Article and Find Full Text PDFEmergency department ophthalmoscopy: physician confidence and clinical practices.
CJEM
January 2025
Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, ON, Canada.
Objectives: Fundoscopy is crucial in the emergency department to identify or rule out serious ocular and neurological conditions. Despite its clinical importance, fundoscopy is often omitted due to the technical challenges associated with traditional direct ophthalmoscopy, particularly for non-ophthalmologists. This study examines emergency physicians' practices, confidence levels, and training related to various modalities of fundoscopy including traditional direct ophthalmoscopes, binocular indirect ophthalmoscopes, panoptic ophthalmoscopes, slit lamp fundoscopy and fundus cameras; and explores the potential role of alternative modalities, such as fundus cameras, in Canadian emergency departments.
View Article and Find Full Text PDFAn adaptive protocol to assess physiological responses as a function of task demand in speech-in-noise testing.
J Neurosci Methods
December 2024
Politecnico di Milano, Piazza Leonardo da Vinci, 32, Milan, 20133, Italy. Electronic address:
Background: Acoustic challenges impose demands on cognitive resources, known as listening effort (LE), which can substantially influence speech perception and communication. Standardized assessment protocols for monitoring LE are lacking, hindering the development of adaptive hearing assistive technology.
New Method: We employed an adaptive protocol, including a speech-in-noise test and personalized definition of task demand, to assess LE and its physiological correlates.
An Unusual Case of Low Vision and Anisocoria Considered a Neurological Finding in the Emergency Department: Ocular Siderosis.
Turk J Ophthalmol
December 2024
Kastamonu Training and Research Hospital, Clinic of Ophthalmology, Kastamonu, Türkiye.
We present the case of a patient who came to the emergency department with a significant decrease in vision and dilated pupil in the left eye. Since neurological pathologies were primarily considered, diffusion brain magnetic resonance imaging (MRI) and brain computed tomography (CT) were requested. After the results were reported as normal, we were consulted.
View Article and Find Full Text PDFCase report on anti-GQ1b antibody syndrome: initial symptoms of pupil palsy and periorbital pain.
Front Immunol
January 2025
Department of Neurology, Chengdu Second People's Hospital, Affiliated Hospital of Chengdu Medical College, Chengdu, Sichuan, China.
Anti-GQ1b antibody syndrome is a spectrum of autoimmune disorders affecting nervous systems. We report a case of a 53-year-old woman presenting mydriasis with acute onset of periorbital pain, photophobia, and subsequently, diplopia. Despite weakly positive anti-GQ1b IgG antibody, the patient exhibited atypical features with isolated ophthalmoplegia and absence of classic Miller-Fisher syndrome triad.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!