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18 results for “Pupil size”
PsPM-PubFe: Pupil size response in a delay fear conditioning procedure with auditory CS and electrical US.
<p>This dataset includes pupil size response (PSR), skin conductance response (SCR), electrocardiogram (ECG) and respiration measurements. Also included are CS and US information, keypress responses, keypress response times and key correctness for each of 22 healthy unmedicated participants (7 males and 15 females aged 26.4+/-5.2 years) participating in a classical (Pavlovian) discriminant delay fear conditioning task. CS consists of two sine tones with constant frequency (220 Hz or 440 Hz, 50-ms onset and offset ramp). US is a train of electric square pulses delivered with a constant current stimulator (Digitimer DS7A, Digitimer, Welwyn Garden City, UK) on participants' dominant forearm through a pin-cathode/ring-anode configuration. SOA betwen the CS and US is 3.5 s. The ITI is randomly determined on each trial to be 7, 9, or 11 s.</p>
Data from: More than meets the eye: predator-induced pupil size plasticity in a teleost fish
<p>1. Most animals are visually oriented, and their eyes provide their "window to the world". Eye size correlates positively with visual performance, because larger eyes can house larger pupils that increase photon catch and contrast discrimination, particularly under dim light, which have positive effects on behaviours that enhance fitness, including predator avoidance and foraging.</p> <p>2. Recent studies have linked predation risk to selection for larger eyes and pupils, and such changes should be of importance for the majority of teleost fishes as they have a pupil that is fixed in size (eyes lack a pupillary sphincter muscle) and, hence, do not respond to changes in light conditions.</p> <p>3. Here, we quantify eye and pupil size of individual crucian carp, a common freshwater fish, following controlled manipulations of perceived predation risk (presence/absence). We also tested if crucian carp responded to increased predation risk by shifts in diel activity patterns.</p> <p>4. We found that crucian carp show phenotypic plasticity with regards to pupil size, but not eye size, as pupil size increased when exposed to predators (pike). Predator-exposed crucian carp also shifted from diurnal to nocturnal activity. Using a modelling exercise, we moreover show that the plastically enlarged pupils significantly increase visual range, especially for small objects under dim light conditions.</p> <p>5. Overall, our results provide compelling evidence for predator-induced pupil enlargement resulting in enhanced visual capabilities in a teleost fish. Pupil-size plasticity in combination with the observed shift towards nocturnal activity may allow for efficient foraging also under dark conditions when predation risk from diurnal and visually oriented predators is reduced. The data highlight the powerful role of predation risk for eye development and evolution. 03-Jul-2020</p>
PsPM-LSOA: Pupil size response, SCR, EMG, ECG and respiration measurement from a classical (Pavlovian) discriminant delay fear conditioning task
<p>This dataset includes eye tracker (including pupillometry), skin conductance, EMG, ECG and respiratory measurements. Also included are task information, keypress responses, keypress response times and key correctness for each of 22 healthy unmedicated participants (13 females and 9 males aged 25.3 +/- 4.3 years) participating in a classical (Pavlovian) discriminant delay fear conditioning task. CS consists of two sine tones with constant frequency (135 Hz or 300 Hz). Assignment of CS frequency to CS-/CS+ is randomised across participants. US is a train of electric square pulses delivered with a constant current stimulator (Digitimer DS7A, Digitimer, Welwyn Garden City, UK) on participants' dominant forearm through a pin-cathode/ring-anode configuration. SOA betwen the CS and US is 7.5 s. The ITI is randomly determined on each trial to be 10.0 +/- 1.4 s.</p>
Pupil size reflects activation of subcortical ascending arousal system nuclei during rest
<p>Neuromodulatory nuclei that are part of the ascending arousal system (AAS) play a crucial role in regulating cortical state and optimizing task performance. Pupil diameter, under constant luminance conditions, is increasingly used as an index of activity of these AAS nuclei. Indeed, task-based functional imaging studies in humans have begun to provide evidence of stimulus-driven pupil-AAS coupling. However, whether there is such a tight pupil-AAS coupling during rest is not clear. To address this question, we examined simultaneously acquired resting-state fMRI and pupil-size data from 74 participants, focusing on six AAS nuclei: the locus coeruleus, ventral tegmental area, substantia nigra, dorsal and median raphe nuclei, and cholinergic basal forebrain. Activation in all six AAS nuclei was optimally correlated with pupil size at 0- to 2-second lags, suggesting that spontaneous pupil changes were almost immediately followed by corresponding BOLD-signal changes in the AAS. These results suggest that spontaneous changes in pupil size that occur during states of rest can be used as a noninvasive general index of activity in AAS nuclei. Importantly, the nature of pupil-AAS coupling during rest appears to be vastly different from the relatively slow canonical hemodynamic response function that has been used to characterize task-related pupil-AAS coupling.</p>
Data from: More than meets the eye: predator-induced pupil size plasticity in a teleost fish
Open the record for dataset details and reuse information.
Pupil size reflects activation of subcortical ascending arousal system nuclei during rest
Open the record for dataset details and reuse information.
Action-based predictions affect visual perception, neural processing, and pupil size, regardless of temporal predictability
<p>Data supporting the findings in:</p> <p>Lubinus, C., Einhäuser, W., Schiller, F., Kircher, T., Straube, B., & van Kemenade, B. M. (2022). Action-based predictions affect visual perception, neural processing, and pupil size, regardless of temporal predictability. <em><strong>NeuroImage</strong>. DOI: XXX</em></p> <p>Details are specified in the readme file.</p>
Effect of Atropine on Pupil Size and Quality of Vision
ClinicalTrials.gov study NCT06071260. IPD Sharing: NO. Countries: 1. Publications: 5.
Correlation Between Pupil Size and Ocular Signs of Pseudoexfoliation Syndrome
ClinicalTrials.gov study NCT05113121. IPD Sharing: YES. Countries: 1. Publications: 4.
The Correlation Between Pupil Size and Retinal Nerve Fibers Changes in Pseudoexfoliation Syndrome.
ClinicalTrials.gov study NCT06588816. IPD Sharing: UNDECIDED. Countries: 0. Publications: 6.
The Effects of Low Concentration Atropine on Pupil Size and Accommodation
ClinicalTrials.gov study NCT02870478. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
Evaluation of NV701 (Pilocarpine 1.25%) Compared With Vuity (Pilocarpine 1.25%) on Pupil Size in Subjects With Presbyopia
ClinicalTrials.gov study NCT06783686. IPD Sharing: NO. Countries: 1. Publications: 0.
tVNS Responsiveness Testing With Pupil Size
ClinicalTrials.gov study NCT06335199. IPD Sharing: YES. Countries: 1. Publications: 0.
Comparison of Epinephrine and Phenylephrine/Ketorolac With Regards to Pupil Size
ClinicalTrials.gov study NCT02895035. IPD Sharing: Not stated. Countries: 0. Publications: 0.
Effect of Preoperative Pupil Size on Quality of Vision After Wavefront-Guided LASIK
ClinicalTrials.gov study NCT00889941. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Comparative Study on Changes in Anterior Chamber Cytokines, Oxidative Stress, and Pupil Size After LenSx and Z8 Femtosecond Lasers
ClinicalTrials.gov study NCT06649799. IPD Sharing: NO. Countries: 1. Publications: 0.
Eye Movement Behaviour and Pupil Size in Natural Outdoor and Indoor Scenes
ClinicalTrials.gov study NCT05971238. IPD Sharing: YES. Countries: 1. Publications: 0.
Does Pupil Size Matters in Refractive Surgery?
ClinicalTrials.gov study NCT01678729. IPD Sharing: Not stated. Countries: 0. Publications: 0.
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