Abstract: . . .  ( r 0.48; p 0.009) (Fig 1). The volume of CA1 was correlated with the volume of CA2 ( r 0.59; p 0.009) (Fig 1). The coefficient of error for these estimates averaged 0.10 0.02 for number of neurons in CA1 and 0.12 0.04 for number of neurons in CA2. Premortem Magnetic Resonance Imaging Hippocampal Volume Correlates with Neuron Number Hippocampal volumes were determined from premor- tem MRIs (Fig 2). MRI hippocampal volumes were highly correlated with the number of neurons in CA1 ( r 0.72; p 0.0004) and volume of CA1 ( r 0.54; p 0.02) but not CA2. In addition, MRI hippocam- pal volumes were highly correlated with . . .
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