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Steven R. Holloway, Michael P. Engles; Flicker fusion as a correlate of hyperacuity. Journal of Vision 2005;5(12):68. doi: https://doi.org/10.1167/5.12.68.
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This study was designed to investigate the possible relationship between spatial and temporal processing in the primary visual cortex. Critical flicker fusion (CFF) threshold is the lowest level of continuous flicker that is perceived as a steady source of light. A recent investigation concluded that CFF is highly related to dorsal stream processing. Hyperacuity is the finest spatial discrimination possible for the human visual system; and it was chosen as a measure of dorsal stream processing because it demonstrates clear improvement effects with training. Fourteen subjects were recruited from the University of Georgia. CFF thresholds were assessed using the method of limits by a 1-deg diameter green test field. Only seven participants expressing either very high or very low CFF threshold were analyzed for this study. Hyperacuity was recorded across time using a pair of black vernier lines against a white background. The results of this study indicate that individuals with the highest CFF thresholds demonstrate improvement in hyperacuity more quickly than individuals with the lowest CFF thresholds. These results imply that a relationship may exist between temporal modulation and spatial processing in the visual cortex.
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