Condon Lau1,2, Kyle Xing1,2,
Kevin C. Chan1,2, Ed X. Wu1,2
1Laboratory of Biomedical Imaging and
Signal Processing, The University of Hong Kong, Hong Kong SAR, China; 2Department
of Electrical and Electronic Engineering, The University of Hong Kong, Hong
Kong SAR, China
The
superior colliculus (SC) and lateral geniculate nucleus (LGN) are the main
destinations for fibers from the optic nerves. Their functions are important
for processing and responding to visual stimuli. BOLD fMRI with TR = 200ms is
used to measure the temporal dynamics of the SC and LGN (of Sprague-Dawley
rats) in response to monocular visual stimuli to better understand their
functions. The results show that the LGN response has smaller amplitude and
is delayed relative to the SC response by approximately 0.8s. This shows that
the neuronal and/or hemodynamic responses in the SC and LGN are temporally
different.