 While his aspirations for becoming more involved in the computational modeling Sejnowski was known for were not realized, it was during this period that met Dr.'s Henriette van Praag and Fred "Rusty"Gage and became interested in neurogenesis.Together these individuals published four influential publications on adult hippocampal neurogenesis, with Christie performing the majority of the electrophysiological recordings.Christie's research has shown that exercise promotes adult neurogenesis and synaptic plasticity in the hippocampus.