OPTIMIZATION OF VISUAL TASKS FOR DETECTING VISUAL CORTEX ACTIVITY IN FMRI STUDIES

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MIRZAJANI A.; OGHABIAN M.A.; RIAHI ALAM N.; FIROOZNIA K.; SABERI H.; JAFARZADEHPOUR E.

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2005 | Volume:2 | Issue:6 Page(s): 79-90

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Title

OPTIMIZATION OF VISUAL TASKS FOR DETECTING VISUAL CORTEX ACTIVITY IN FMRI STUDIES

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Keywords

VISUAL TASKQ4

FUNCTIONAL MAGNETIC RESONANCE IMAGINGQ2

VISUAL CORTEXQ4

FMRIQ4

Abstract

Introduction: FUNCTIONAL MAGNETIC RESONANCE IMAGING is a good non-invasive method for the evaluation and mapping of human brain especially VISUAL CORTEX.One of the most important subjects in this background is optimizing visual stimuli in various forms of VISUAL TASKs for acquiring significant and robust signals.Materials and methods: The effects of physical parameters of visual stimuli on fourteen health volunteers for detecting visual cortical activity are evaluated by FUNCTIONAL MAGNETIC RESONANCE IMAGING. These parameters were temporal & frequency (TF), the different patterns of activation including: square wave and sine wave grating, and two different states of rest including black and white screen.Results: The results show that BOLD signal will be maximally in the TF of 8 Hz, and using the black screen in the rest state. However there isn't significant difference between square-wave and sine-wave grating in producing visual activation in cortex.Discussion and Conclusion: Physical parameters of VISUAL TASKs are effective in detecting visual cortical activity, and it is necessary to pay attention to them for taking significant and robust signal. The VISUAL TASKs with TF of 8 Hz and one pattern of square-wave or sine-wave in activation state, and black screen in rest state are optimally suitable for FMRI studies. These results are consistent with recent studies, optical mechanisms of the eye and neuronal function in VISUAL CORTEX.

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APA: Copy

MIRZAJANI, A., OGHABIAN, M.A., RIAHI ALAM, N., FIROOZNIA, K., SABERI, H., & JAFARZADEHPOUR, E.. (2005). OPTIMIZATION OF VISUAL TASKS FOR DETECTING VISUAL CORTEX ACTIVITY IN FMRI STUDIES. IRANIAN JOURNAL OF MEDICAL PHYSICS, 2(6), 79-90. SID. https://sid.ir/paper/96915/en

Vancouver: Copy

MIRZAJANI A., OGHABIAN M.A., RIAHI ALAM N., FIROOZNIA K., SABERI H., JAFARZADEHPOUR E.. OPTIMIZATION OF VISUAL TASKS FOR DETECTING VISUAL CORTEX ACTIVITY IN FMRI STUDIES. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2005;2(6):79-90. Available from: https://sid.ir/paper/96915/en

IEEE: Copy

A. MIRZAJANI, M.A. OGHABIAN, N. RIAHI ALAM, K. FIROOZNIA, H. SABERI, and E. JAFARZADEHPOUR, “OPTIMIZATION OF VISUAL TASKS FOR DETECTING VISUAL CORTEX ACTIVITY IN FMRI STUDIES,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 2, no. 6, pp. 79–90, 2005, [Online]. Available: https://sid.ir/paper/96915/en

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