Lecture Series Talks
Leipzeig Lectures on Language (psycholinguistics, linguistics)
Gallaudet University, Ph.D. in Educational Neuroscience Distinguished Lecture Series (neuroscience, psychology, cognitive science)
University of British Columbia, Ask a Developmental Psychologist (cognitive development)
Linguistics Flash Mobs (linguistics)
Abralin (Brazilian Linguistics Association) lecture series (linguistics)
C-STAR lecture series (aphasia)
World Wide (general science; there are specific tags for Psychology and Neuroscience)
National Academy of Sciences Sackler Colloquia (general science)
Other videos
Julie Hochgesang's youtube channel (sign language linguistics; note that Dr. Hochgesang is Deaf)
Liina Pylkkanen's Cognitive Neuroscience lectures (Dr. Pylkkanen is a neuroscientist with a PhD in Linguistics from MIT)
Bill Vicars youtube channel (for learning ASL; note that Dr. Vicars is Deaf)