Angelman Syndrome Video Assessment (ASVA) Source Material Study

* Caregiver reports that the individual with AS has a laboratory-confirmed diagnosis of Angelman syndrome * Individual with AS is at least 1 year old * Caregiver is willing and able to provide informed consent for themselves and oversee study participation * Caregiver or legal guardian is willing to provide informed consent on behalf of the individual with AS * Caregiver is comfortable reading and speaking in English * Caregiver has access to a smartphone or tablet that is compatible with the study app OR caregiver has internet access and is willing to use a wi-fi only device to record and upload videos NT-Caregiver dyads will be eligible for inclusion if the: * Neurotypical individual is between 1 and 8 years of age * Caregiver is willing and able to provide informed consent and oversee study participation and NT individual is willing and able to provide assent, as applicable * Caregiver is comfortable reading and speaking in English * Caregiver has access to a smartphone or tablet that is compatible with the study app OR caregiver has internet access and is willing to use a wi-fi only device to record and upload videos Participant-Caregiver dyads will be excluded from the study only if they do not meet the inclusion criteria above.