Thank you for the opportunity to help you with your question!
Eustress is completely independent of the type of stressor.
Challenges where feedback is unknown provokes negative eustress in me (job interviews, performance reviews, presentations), whereas I have a positive regard (and positive eustress) for the stressful tasks of writing and math.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 12th, 2015
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