The goal of this clinical trial is to learn how night shift-induced sleep debt affects oculomotor patterns, attentional state, and diagnostic performance in emergency radiologists.
The main questions it aims to answer are:
* Does sleep debt from a night shift alter oculomotor parameters, as eyes movements (speed and amplitude), fixation duration, pupil size? * Does a night shift impact radiologists' diagnostic accuracy, attentional state, and perceived fatigue? Researchers will compare radiologists after a night shift (sleep-deprived) with the same radiologists after a night of rest (control) to see if fatigue-related changes affect both visual exploration strategies and diagnostic performance.
Participants will:
* Perform a guided saccade task assessed by eye tracking (primary endpoint), * Read thoracic CT scans (with and without pulmonary embolism cases) to assess diagnostic performance and visual exploration patterns, * Undergo EEG recording to measure attentional state, * Complete self-report questionnaires on sleepiness and fatigue.
In their current position for at least one year
Working at one of the IMADIS Group on-call centers
Performing night shifts during the study period
Able to wear an actimeter watch during the study period (it may be removed during certain procedures, but must be put back on afterwards)
None
Single group
Electroencephalogram
DeviceEEG measurement to assess attentional state
Actigraphy
DeviceEvaluation of sleep-wake phases 24 hours prior to eye tracking measurement
Eye Tracking
DeviceAssessment of ocular parameters during controlled eye tracking: guided saccade task followed by analysis of chest scans to detect pulmonary embolism. Measurement of ocular saccade parameters (distance, velocity), fixation time and pupil diameter. Measurements performed twice: after a night on call and after a night of rest.
Questionnaires
Other interventionMeasurements of sleepiness (Karolinska Sleep Scale KSS, Epworth Sleep Scale ESS), mental fatigue (EVA Scale), insomnia (Insomnia Severity Index, ISI) and chronotype (Morningness Eveningness Questionnaire, MEQ) * Inclusion visit: MEQ * Before the first evaluation: ISI, KSS, ESS, EVA * Before the second evaluation: ISI, KSS, ESS, EVA
Comparison of slope of the relationship between maximum speed and saccade magnitude
Slope of the relationship between maximum saccadic speed and saccade magnitude This parameter reflects the dynamics of saccadic eye movements. It is derived from the main sequence, which describes the linear relationship between the amplitude of a saccade (in degrees of visual angle) and its maximum velocity (in degrees per second). The slope quantifies how rapidly maximum saccadic speed increases with increasing saccade magnitude. A steeper slope indicates faster oculomotor responses for larger saccades, whereas a reduced slope may reflect fatigue, reduced alertness, or impaired oculomotor function.
Comparison of duration of fixations on areas of interest, in milliseconds
Eye tracking measurement performed on pulmonary embolism examination readings. Fixation time measured on areas of interest defined on each examination.
Comparison of percent of embolisms detected
Measurement during the reading of chest scans. Information collected using the "logbook" and compared to the gold standard.
Comparison of pupil diameter
Pupil diameter measured using eye tracking during the guided saccade task
Comparison of attentional systems
EEG measurement of different brain waves (Theta, Alpha, Beta, and Gamma activities) representative of the attentional system.
Sleep-wake cycle over the last 24 hours
Measurement taken to determine the subjects' sleep-wake cycle during the 24 hours preceding each measurement. Assessment of the number of hours slept in order to normalize the data during analysis, determined by actimetric measurement
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IMADIS Technologies et Services
Lead sponsor
Lyon Neuroscience Research Center (CRNL)
Collaborator
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