Researchers from Yale University have developed a new test that measures changes in synapses, which is the structure that allows neurons to communicate with other neurons or cells through electrical/chemical signals. The technique uses positron emission tomography (PET) imaging technology to measure the activity of a specific protein linked to synapses. Synaptic loss is an established indicator of cognitive decline. The study was a collaborative project between researchers at the Yale PET Center and the Yale Alzheimer’s Disease Research Unit (ADRU). The results from the study, "