David Souto - Academia.edu (original) (raw)

Papers by David Souto

Transportation Research Part F: Traffic Psychology and Behaviour

Our ability to estimate the duration of sub-second visual events is prone to distortions, which d... more Our ability to estimate the duration of sub-second visual events is prone to distortions, which depend both on sensory and decisional factors. To disambiguate between these two influences, we can look at the alignment between discrimination estimates of duration at the point of subjective equality and confidence estimates when the confidence about decisions is minimal, because observers should be maximally uncertain when two stimuli are perceptually the same. Here, we used this approach to investigate the relationship between the speed of a visual stimulus and its perceived duration. Participants were required to compare two intervals, report which had the longer duration, and then rate their confidence in that judgement. One of the intervals contained a stimulus drifting at a constant speed, whereas the stimulus embedded in the other interval could be stationary, linearly accelerating or decelerating or drifting at the same speed. Discrimination estimates revealed duration compress...

Demonstration of a speed discrimination and time-to-arrival task accompanying paper entitled &quo... more Demonstration of a speed discrimination and time-to-arrival task accompanying paper entitled "Judging vehicle speed and time-to-arrival from the roadside: Eye movements and perception" The Video Demonstration shows a trial in the speed discrimination task. The time-to-arrival task judgements, only the prompt to respond changes to "Which vehicle arrived earlier?".<br>

Ear & Hearing, 2022

Objectives: The purpose of the current study was to investigate the potential of pupillometry to ... more Objectives: The purpose of the current study was to investigate the potential of pupillometry to provide an objective measure of competition between tinnitus and external sounds during a test of auditory short-term memory. Design: Twelve participants with chronic tinnitus and twelve control participants without tinnitus took part in the study. Pretest sessions used an adaptive method to estimate listeners’ frequency discrimination threshold on a test of delayed pitch discrimination for pure tones. Target and probe tones were presented at 72 dB SPL and centered on 750 Hz±2 semitones with an additional jitter of 5 to 20 Hz. Test sessions recorded baseline pupil diameter and task-related pupillary responses (TEPRs) during three blocks of delayed pitch discrimination trials. The difference between target and probe tones was set to the individual’s frequency detection threshold for 80% response-accuracy. Listeners with tinnitus also completed the Tinnitus Handicap Inventory (THI). Linear...

Videos showing the use of a cursor to write words by using a virtual keyboard. The cursor has to ... more Videos showing the use of a cursor to write words by using a virtual keyboard. The cursor has to dwell on a letter box for this letter to be selected (typed). <br>Movie 1 shows a condition in which the participant controls the cursor with gaze (measured with an Eyelink 1000 eyetracker). <br>Movie 2 shows a condition in which the participant controls with cursor with a computer mouse. <br>(Refresh frequency was set at 75Hz for the sake of the recording)

Scientific Reports, 2021

To avoid collisions, pedestrians depend on their ability to perceive and interpret the visual mot... more To avoid collisions, pedestrians depend on their ability to perceive and interpret the visual motion of other road users. Eye movements influence motion perception, yet pedestrians’ gaze behavior has been little investigated. In the present study, we ask whether observers sample visual information differently when making two types of judgements based on the same virtual road-crossing scenario and to which extent spontaneous gaze behavior affects those judgements. Participants performed in succession a speed and a time-to-arrival two-interval discrimination task on the same simple traffic scenario—a car approaching at a constant speed (varying from 10 to 90 km/h) on a single-lane road. On average, observers were able to discriminate vehicle speeds of around 18 km/h and times-to-arrival of 0.7 s. In both tasks, observers placed their gaze closely towards the center of the vehicle’s front plane while pursuing the vehicle. Other areas of the visual scene were sampled infrequently. No di...

Psychonomic Bulletin & Review, 2020

Physical interactions between objects, or between an object and the ground, are amongst the most ... more Physical interactions between objects, or between an object and the ground, are amongst the most biologically relevant for live beings. Prior knowledge of Newtonian physics may play a role in disambiguating an object’s movement as well as foveation by increasing the spatial resolution of the visual input. Observers were shown a virtual 3D scene, representing an ambiguously rotating ball translating on the ground. The ball was perceived as rotating congruently with friction, but only when gaze was located at the point of contact. Inverting or even removing the visual context had little influence on congruent judgements compared with the effect of gaze. Counterintuitively, gaze at the point of contact determines the solution of perceptual ambiguity, but independently of visual context. We suggest this constitutes a frugal strategy, by which the brain infers dynamics locally when faced with a foveated input that is ambiguous.

Computers in Human Behavior, 2021

Frontiers in Human Neuroscience, 2016

Frontiers in Human Neuroscience, 2015

Journal of vision, 2015

When an error is injected to saccade endpoints by displacing the target midflight during saccades... more When an error is injected to saccade endpoints by displacing the target midflight during saccades, observers typically adjust their saccade amplitudes on later trials to reduce landing error. Since target displacements are much harder to see during a saccade than during fixation (termed "saccadic suppression of displacement"), it is often assumed that observers are unaware of the manipulation for typical displacement amplitudes. Different conceptions of saccade adaptation predict different effects of target visibility on learning rates. One states that when displacements are less likely to be seen the error is attributed to the motor system instead of the external world and learning should be faster. Another one gives no role to visual error attribution itself, but predicts that learning rates are a function of the uncertainty of the visual error and the uncertainty in the visuomotor mapping. In the latter case learning rates should increase with the visibility of the targ...

Proceedings SCCC'98. 18th International Conference of the Chilean Society of Computer Science (Cat. No.98EX212)

2008 18th International Conference on Electrical Machines, 2008

Abstract-This paper presents a fast software to compute the Three-Dimensional (3D) leakage field ... more Abstract-This paper presents a fast software to compute the Three-Dimensional (3D) leakage field in Shell type power transformers up to 500 kV. The proposed software, Shell-RNM(3D), is based on the Reluctance Network Method (RNM) and developed in EFACEC Energia. ...

The Analyst, 2015

This paper describes the design, implementation and validation of a sensitive and integral techno... more This paper describes the design, implementation and validation of a sensitive and integral technology solution for endotoxin detection.

Journal of Vision, 2010

Anticipatory pursuit allows accurate eye movement initiation with little delay when the target ha... more Anticipatory pursuit allows accurate eye movement initiation with little delay when the target has a predictable behavior, either in its direction, timing or speed. Anticipatory velocity is less extreme when many target speeds are randomly interleaved within a block, compared to ...