This video contains the introduction to using the AFNI graphical user interface (GUI). It mostly consists of hands-on demonstrations and exercises. * Installation of AFNI is a prerequisite: https://bit.ly/AFNIstuff * Features of the AFNI main controller, including help and hints * Features of the AFNI image viewer Due to length, this video has an immediate sequel, largely covering feature of the AFNI time series graph viewer. The few slides for this video (and its sequel) presentation are in file afni01_intro_PART_2.pdf