“…Pretangle Tau, thought to be the toxic form of tau, has now been detected in MCI and AD and has been found to be one of the earliest tau lesions that correlates with cognitive status (Mufson et al, 2014). Synapse loss (Bastin et al, 2020;Buchanan et al, 2020;Mecca et al, 2020;Pereira et al, 2021), changes in hormone levels (Cheng et al, 2021), changes in blood biomarker levels (Guzman-Martinez et al, 2019;Montoliu-Gaya et al, 2021), electroencephalogram (EEG) readings (Hulbert and Adeli, 2013;Lin et al, 2021), retinal assays (Ashok et al, 2020;Mirzaei et al, 2020), and changes in specific protein levels (Buchanan et al, 2020;Colom-Cadena et al, 2020) are some of the myriad assays being developed to try to detect AD earlier and predict when and if the change from mild cognitive impairment (MCI) to AD will occur (Zhang T. et al, 2021). All of these new developments are focused toward enabling earlier therapeutic intervention when chances for success would be greatest.…”