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35 results for “psychophysics”
Psychophysical thresholds for figure-ground discrimination driven by binary textures
<p>Documentation and matlab data files containing psychophysical data for figure-ground segregation driven by binary textures. Methodological details of measurements and analyses (along with interpretation) are provided in Victor, J.D., and Conte. M.M. (2022) Functional recursion of orientation cues in figure-ground separation. Vision Research 197, 108047, doi.org/10.1016/j.visres.2022.108047.</p>
Human Psychophysics Dataset on Figure Ground Segregation in Texture Stimuli
<div> <div>The dataset is derived from a psychophysics experiment where 8 participants discriminated the orientation of a rectangular figure within a texture stimulus comprised of Gabor annuli. The figure region differed from the background in its contrast distribution, controlled by two independent variables: Contrast Heterogeneity and Grid Coarseness. Contrast Heterogeneity refers to the range of contrasts exhibited by Gabor annuli. In this experiment, there were five values for Contrast Heterogeneity in the figure: 0.01, 0.2575, 0.505, 0.7525, and 1. The contrast distribution of the background was always maximally heterogeneous with Contrast Heterogeneity equal to 1. Grid Coarseness, on the other hand, refers to the scaling factor that controls the spacing between the Gabor annuli. It determines the density of the grid pattern in the background <em>and</em> the figure region. In this experiment, there were five values for Grid Coarseness: 1, 1.125, 1.250, 1.375, and 1.5. The experiment consisted of 9 sessions, each containing multiple blocks of trials. Each block of trials contained 25 unique stimulus conditions, defined by the combination of Contrast Heterogeneity and Grid Coarseness.</div> <div> <p><strong>Stimuli, Tasks, and Procedure </strong></p> </div> <div> <p>Each texture stimulus consisted of a full-screen irregular grid of non-overlapping Gabor annuli placed on a grey background. The Gabor annuli had a diameter of 0.7°, a spatial frequency of 5.7 cycles/degree, and a mean luminance of 60.76 Cd/m2. Embedded within this texture was a rectangular figure region located in the lower right quadrant of the screen, which differed from the rest of the texture in the contrast distribution of its annuli. For sessions 1-8, the figure center was placed at an eccentricity of (7 ± 1)° but slightly varied in terms of polar angle such that it was completely inside the lower right quadrant. For session 9 (transfer session), the figure was placed in the upper left quadrant. </p> </div> <div> <p>Participants were required to indicate whether the rectangular figure was oriented horizontally or vertically by pressing the right and left arrow keys, respectively. The experiment employed a two-alternative forced-choice design, in which participants had to make a decision about the orientation of the figure in each trial. Responses were given with the middle and index fingers of the right hand. In each trial, the stimulus was presented for 1000 ms or less if the participant lost fixation or provided a response. Participants were required to maintain fixation throughout the presentation of the stimulus. </p> </div> <div> <p>After each trial, participants received feedback on their response. If the response was correct, a green fixation point was presented for 500 ms. If the response was incorrect, a red fixation point was presented for 500 ms. </p> </div> <div> <p>The experiment was conducted in a dimly lit room. A chin and head-rest was used to support the participant's head and to keep eye-screen distance constant at 57 cm. Stimuli were displayed on a 19'' Samsung SyncMaster 940BF LCD monitor. Stimulus representation and response recording were performed using Psychtoolbox-3 for Matlab 64-Bit (Version 3.0.14 - Build date: Apr 6th, 2018) running on a Windows operating system. Fixation was monitored with a desktop-mounted Eyelink 1000 eye-tracker (SR Research Ltd.) with a sampling frequency of 500 Hz or 1000 Hz and a spatial resolution of <0.01° RMS. Eye-movement data were down-sampled to 250 Hz. </p> </div> <div> <p><strong>Procedure for Handling Aborted Trials </strong></p> </div> <div> <p>If a participant's gaze fell outside the fixation window during the fixation period preceding the stimulus, or during stimulus presentation, the trial was aborted. Aborted trials were repeated at a randomly chosen time during the experiment. </p> </div> <div> <p><strong>Parametrization of the Experimental Setup </strong></p> </div> <div> <p>The eye-screen distance was set to 57 cm. The stimulus presentation time was set to 1000 ms. The inter-trial interval was set to 900 ms. Each session consisted of 30 blocks, with 25 trials per block. </p> </div> <div> <p><strong>Transfer Session </strong></p> </div> <div> <p>The transfer session (session 9) was unique in that the rectangular figure was presented in the upper left quadrant of the screen, rather than the lower right quadrant as in sessions 1-8. This was done to test the transfer of learning to a new location. Participants were made aware of the figure displacement but were not told in which quadrant to expect it. </p> </div> <div> <p><strong>Variables </strong></p> </div> <div> <p>The dataset includes identifiers for each participant (SubjectID), session (SessionID), and block of trials (BlockID). For each trial, the dataset includes the condition (Condition), the contrast heterogeneity (ContrastHeterogeneity), the grid coarseness (GridCoarseness), the participant's response (IndicatedOrientation), the actual orientation of the rectangular region (ActualOrientation), and whether the participant's response was correct (Correct). The dataset also includes demographic information comprising their unique identifier (SubjectID), age (Age), and sex (Sex). </p> <p><strong>Ethics</strong></p> <p>After receiving full information about all procedures and about the right to withdraw participation at any time, they provided written informed consent according to the Helsinki Declaration. All procedures were approved by the local Ethical Committee of the Faculty of Psychology and Neuroscience (ERCPN). Participants received<br>monetary reward.</p> </div> </div>
Using psychophysical performance to predict short-term ocular dominance plasticity in human adults
<p>This is the dataset reported in the manuscript "Using psychophysical performance to predict short-term ocular dominance plasticity in human adults" published in the Journal of Vision 2020;20(7):6. doi: <a href="https://doi.org/10.1167/jov.20.7.6">https://doi.org/10.1167/jov.20.7.6</a></p> <p> </p>
PsySuite: Performing multimodal psychophysical testing within the Android environment
<p>Data used for either the hardware or the behavioral validation of the Android APP <em>PsySuite</em>.</p>
Frequency-dependent cortical plasticity: evidence from psychophysics, functional imaging and computational modelling.
<p>fMRI data relating to the paper entitled 'Frequency-dependent cortical plasticity: evidence from psychophysics, functional imaging and computational modelling'. </p>
Neural Substrates for Early Data Reduction in Fast Vision: A Psychophysical Investigation
<p><span>The name of each ‘.mat’ file reports the subject code, the condition (Baseline or Flicker), and the task (Sketch, Motion, or Orientation).</span></p> <p><strong><span>For Motion and Orientation tasks:</span></strong></p> <p><span>The matrices contain one row per trial and four columns:</span></p> <p>o <strong>Column 1:</strong> trial number</p> <p>o <strong>Column 2:</strong> tested contrast</p> <p><span>o </span><strong><span>Column 3:</span></strong><span> response (1 = left moving/oriented gabor, 2 = right moving/oriented gabor)</span></p> <p><span>o </span><strong><span>Column 4:</span></strong><span> correct response (1 = correct, 0 = wrong).</span></p> <p><strong><span>For the Sketch task:</span></strong></p> <p><span>The matrices contain one row per trial and seven columns:</span></p> <p>o <strong>Column 1:</strong> trial number</p> <p>o <strong>Column 2:</strong> tested contrast</p> <p>o <strong>Column 3:</strong> sketch number</p> <p>o <strong>Column 4:</strong> target image number</p> <p>o <strong>Column 5:</strong> distractor image number</p> <p><span>o </span><strong><span>Column 6:</span></strong><span> response (1 = left image, 2 = right image)</span></p> <p><span>o </span><strong><span>Column 7:</span></strong><span> correct response (1 = correct, 0 = wrong).</span></p> <p><span> </span></p>
Data from: Ready to detect a reversal of time's arrow: a psychophysical study using short video clips in daily scenes
<p><span>It is generally believed that time flows in one direction and that a reversal of time's arrow would render the external world nonsensical. We </span><span>evaluated</span><span> our ability to tell the direction of time's arrow in a wide range of dynamic scenes in our daily life by presenting 360 video clips in the correct or incorrect direction</span><span>. </span><span>Participants, who judged the direction in a speeded manner, erred in 39% of trials when a video was played in reverse</span><span>,</span><span> but in </span><span>only </span><span>9% when it was played normally. Due to the bias favouring the "forward" judgement, reaction was generally faster for the forward response. However, </span><span>the</span><span> reaction became paradoxically faster and more synchronous for the detection of reversal in some critical occasions such as forward motion</span><span>, </span><span>free fall, diffusion, division, and addition of materials by hand. Another experiment with a fraction of the video clips revealed that reversal replay of these videos provided instantaneous evidence strong enough to overtake the forward judgment bias. We suggest that our brain is equipped with a system that predicts how the external organisms behave or move in these critical occasions and that the prediction error of the system contributes to the fast "reversal" detection. </span></p>
Mechanisms of Acupuncture Analgesia on Experimental Dental Pain - A Psychophysical Study (Phase1)
ClinicalTrials.gov study NCT02589418. IPD Sharing: Not stated. Countries: 1. Publications: 2.
The Impact of Mindfulness-Based Intervention on Psychophysical Health
ClinicalTrials.gov study NCT06064708. IPD Sharing: NO. Countries: 1. Publications: 17.
Mechanism-based Choice of Therapy: Can Treatments Success in Fibromyalgia Patients be Coupled to Psychophysical Pain Modulation Profile?
ClinicalTrials.gov study NCT01268631. IPD Sharing: Not stated. Countries: 1. Publications: 5.
Effects of Global Postural Reeducation on Psychophysical Wellbeing in Housewives With Chronic Non-specific LBP.
ClinicalTrials.gov study NCT07203950. IPD Sharing: NO. Countries: 1. Publications: 4.
Onco Move - Improvement of Psychophysical Fitness in Adult Cancer Survivors
ClinicalTrials.gov study NCT07087652. IPD Sharing: UNDECIDED. Countries: 1. Publications: 11.
Effect of Psychosocial and Psychophysical Factors and Preemptive Analgesia on Postoperative Pain in Upper Limb Surgery
ClinicalTrials.gov study NCT05248152. IPD Sharing: YES. Countries: 1. Publications: 38.
Assessment of the Psychophysical State During Rehabilitation Treatment With Lokomat
ClinicalTrials.gov study NCT05767268. IPD Sharing: NO. Countries: 1. Publications: 0.
Data from: Ready to detect a reversal of time’s arrow: a psychophysical study using short video clips in daily scenes
Open the record for dataset details and reuse information.
Auditory Training With Speech Related Acoustic Cues Using Psychophysical Testing
ClinicalTrials.gov study NCT03867032. IPD Sharing: NO. Countries: 0. Publications: 18.
Ethnic Differences in Response to Topical Capsaicin: A Psychophysical Study on Healthy Subjects
ClinicalTrials.gov study NCT00655811. IPD Sharing: NO. Countries: 1. Publications: 0.
Psychological, Psychophysical and Epigenetic Determinants of Chronic Pain After Cytoreductive - Hyperthermic Intraoperative Chemotherapy
ClinicalTrials.gov study NCT05083338. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Psychophysical Analysis of Adolescent Patients With Obesity and Efficacy of the Respiratory Approach (PSICOFISADOLOB).
ClinicalTrials.gov study NCT06296407. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Advancement of Psychophysics of Pain Modulation From Lab to Clinic: Constructing Susceptibility Profile for Appearance of Postoperative Neuropathic Pain
ClinicalTrials.gov study NCT00305136. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.