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We recruited $n=21$ medical students per an approved IRB protocol to participate in a longitudinal study regarding the relationship of sympathetic arousal and skill in learning micro-surgical tasks. The subjects had to pay five visits, lasting one hour each, in order to practice micro-surgical cutting and suturing in an inanimate simulator. In their first visit, and after signing an informed consent, the subjects completed a biographic questionnaire, and a trait anxiety inventory. At the end of their last visit they completed a post-study questionnaire. During the main part of each session, the subjects underwent the following treatments: 1. Baseline: The subjects were relaxing for 5 min, listening to spa music. They were facially recorded by a thermal and visual camera. 2. Cutting: The subjects had to perform precision cutting in the inanimate simulator. They were facially recorded by a thermal and visual camera. 3. Sutiring: The subjects had to perform suturing in the inanimate simulator. They were facially recorded by a thermal and visual camera. After the cutting treatment the subjects had to fill out a NASA-TLX questionnaire. The subjects also filled out a NASA-TLX questionnaire after the suturing session. The NASA-TLX instrument features five subscales measuring different aspects of the subjects' perceptions regarding task difficulty. **Data Organization** The data is organized per subject in a way that largely reflects the experimental design. At the root level, there is a master index file that contains information regarding the state of the dataset. In this file, "1" stands for a data item that is present, while "0" stands for a data item that is missing, due to technical or other reasons. At the root level, there is also a file reporting the time and accuracy performance of the subjects, as recorded by the evaluating surgeon. Within each subject folder there are files containing biographic, trait psychometric, and post-study views of the subject. There are also the subfolders for each of the visits the subject paid. Each of these subfolders holds the measurements that were taken in each task. These are stress measurements expressed as perinasal signals for the duration of the task, and NASA-TLX scores taken at the end of the respective treatment.
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