How time flies! I would like to express my most sincere gratitude to God for being my light, wisdom, strength, and for all the guidance He extended to me through some great people during my entire doctoral training, as well as the completion of this book.The first of such great persons is my first supervisor and promoter, Prof. Dr. Roelien Bastiaanse. I would like to express my heartfelt thanks to you for taking me on as a PhD student, for your vigorous scholarly inputs and continuous guidance, our shared joy in talking about my project, and your timely and lucid comments on my manuscripts, which brought this project to a timely completion. I deem it a privilege that we got along well both professionally and personally. Ik hoop dat ik ooit de juiste woorden kan vinden om mijn dankbaarheid te uiten voor wat je de afgelopen acht jaar voor me hebt gedaan en betekend hebt.I am very thankful to my co-supervisors Prof. Dr. Lyndsey Nickels and Dr. Srdjan Popov. Thank you, Lyndsey! Although you joined the supervisory team during the last year of my project, it always felt like you had been there since the beginning. Your positivity, guidance, thorough and timely feedback undoubtedly led to the successful completion of this thesis. My sincere gratitude goes to Srdjan for all that you taught me about EEG data pre-processing and analysis. You made me develop a strong interest in working on EEG data. Thanks for all your flexibility, advice, and the good relationship we have had over the years.