Title :
Spatial Frequency Dependence of the Human Visual Cortical Response to Temporal Frequency Modulation studied by fMRI
Author :
Mirzajani, A. ; Oghabian, M.A. ; Riyahi-Alam, N. ; Saberi, H. ; Firuznia, K.
Author_Institution :
Dept. of Optometry, Iran Univ. of Med. Sci.
Abstract :
The brain response to temporal frequencies (TF) has been already reported, but with no study for different TF in respect to various spatial frequencies (SF). fMRI was performed by 1.5T GE-system in 14 volunteers during checkerboard visual stimulation, with TFs of 4, 6, 8 and 10 Hz in low and high SFs of 0.5 and 8cpd. The averaged percentage BOLD signal changes demonstrated the amplitude of the fMRI response to different TFs which was maximally at 6 Hz for high SF of 8cpd, and at 8 Hz for low SF of 0.5cpd. The results are useful for vision therapy (such as the treatment of Amblyopia) and for fMRI applications incorporating visual tasks
Keywords :
biomedical MRI; blood; brain; oxygen; vision; 1.5 T; 10 Hz; 4 Hz; 6 Hz; 8 Hz; averaged percentage BOLD signal changes; brain response; checkerboard visual stimulation; fMRI; human visual cortical response; spatial frequency dependence; temporal frequency modulation; vision therapy; visual tasks; Biomedical engineering; Biomedical imaging; Frequency dependence; Frequency modulation; Humans; Materials science and technology; Medical treatment; Neurons; Physics; Vision defects;
Conference_Titel :
Engineering in Medicine and Biology Society, 2005. IEEE-EMBS 2005. 27th Annual International Conference of the
Conference_Location :
Shanghai
Print_ISBN :
0-7803-8741-4
DOI :
10.1109/IEMBS.2005.1615807
