 Consent Participants will be identified by the clinicians working in the memory clinic or through posters in memory clinic and at other University sites to attract normal volunteers. A Participation Information Sheet PIS will be given to them either directly or via post. Participants will have sufficient time to read the PIS and be able to ask questions. The PIS will inform the participant of the benefits and potential risks involved in taking part in this study. They will be made aware of the possibility that incidental changes are rarely detected. If this is seen they would be informed and we would arrange appropriate management. The person will be consented when they come in for the EEG recordings. Investigators will explain to all participants that they will be able to leave the study at any time including during the EEG recording and in those that we plan to repeat the EEG can decline the 2nd test. The Clinical Department of Neurophysiology has experience in performing EEG in all ages including those with dementia and cognitive impairment. The person with dementias care-giver or family member can come to the department and be in the room for the entire time the EEG recording takes place. 