Subjective ratings directory

Resumen

<b>Directory content</b>: This directory contains six .CSV files with screening (i.e., IDs ScreeningData) and subjective (i.e., IDs SubjectiveData; MEQr, SSS, BORG, NASA-TLX, MSAQ, for the acronyms see below) data. Data descriptions are reported in an .xlsx file (Legend_DataSubjective).<b>Method and instruments</b>: Through the experiment, we asked drivers to fill in seven questionnaires (digital format). First, we asked drivers to fill in a questionnaire aiming to collect sociodemographic data (e.g., age, handiness). Then, we used the reduced version of the Morningness – Eveningness Questionnaire (MEQr; Adan and Almirall, 1991) and the Spanish Driving Behavior Questionnaire (SDBQ; López de Cózar et al., 2006). The MEQr is a 5-item questionnaire assessing preferences in sleep-wake and activity schedule and allowing the classification of individuals into one of the following subtypes: definitely morning type (22–25 points); moderately morning type (18–21); neither type (12–17); moderately evening type (8–11); and definitely evening type (4–7). The SDBQ is a 34-item questionnaire that allows the identification of adaptive and maladaptive driving styles. Drivers answered the SDBQ items on a Likert scale ranging from 0 (never) to 10 (always).To assess the drivers’ perceived sleepiness and fatigue in three separate measuring times (i.e., pre-driving session, after 90-min of driving, and at the end of the session [after ∼ 180-min]), we administered the Standford Sleepiness Scale (SSS; Hoddes et al., 1973) and the Borg Scale of Perceived Exertion (BORG; Borg, 1998). The SSS provides a global measure of how alert a person is feeling, ranging between 1 and 7. The BORG indicates the level of fatigue, and consists of a numerical scale (ranging from 6 to 20) anchored by “not exertion at all” (score 6) to “maximal exertion” (score 20). To fill both questionnaires after 90 minutes of driving, the participants used the dedicated tablet inside the simulator (for further details, see Driving simulator indices directory). If the vehicle was set in manual driving modality, drivers were instructed to temporarily stop the vehicle.At the end of the driving session, to assess the degree of task complexity and the level of motion sickness experienced, we used the NASA-Task Load Index (NASA-TLX; Hart, 2006) and the Motion Sickness Assessment Scale (MSAQ; Gianaros et al., 2001). The NASA-TLX assesses the task load through six bipolar dimensions: mental, physical, and temporal demand, own performance, effort, and frustration, using a total score between 0 and 100 (higher values indicate higher perceived task load). The MSAQ includes 16 brief statements describing the most common motion sickness symptoms (e.g., “I felt sick to my stomach”) using a Likert scale ranging from 1 (“not at all”) to 9 (“severely”).