Magnocellular processing and reading ability : the effect of test sensitivity
Research into reading difficulties is continuously evolving, with a plethora of suggested causes. Lovegrove, Heddle, and Slaghuis (1980) suggested that one such cause was an abnormality of the visual magnocellular system which can result in visual confusion in some people with reading difficulties. However, failure to replicate findings have led some to disregard the theory (Skottun, 2000). This controversy can in part be attributable to the range of processing levels within the visual system and the range of parameter levels that have been used by studies assessing magnocellular function. Consequently the aim of this research was to investigate the relationship between mag nocellular function and reading ability at varying levels of the visual system, under systematic variations in parameter levels and with varying methods of assessment, to identify the test that produces the most sensitive relationship between reading ability and magnocellular function in children. An investigation into Random Dot Kinematogram (RDK) parameter levels in Studies 1 and 2 found that an integration time threshold with a dot speed of 20âą /s and a contrast of 4% accounted for the largest variance in reading ability. In Study
Sperring, Rachael
Magnocellular processing and reading ability : the effect of test sensitivity. Research into reading difficulties is continuously evolving, with a plethora of suggested causes. Lovegrove, Heddle, and Slaghuis (1980) suggested that one such cause was an abnormality of the visual magnocellular system which can result in visual confusion in some people with reading difficulties. However, failure to replicate findings have led some to disregard the theory (Skottun, 2000). This controversy can in part be attributable to the range of processing levels within the visual system and the range of parameter levels that have been used by studies assessing magnocellular function. Consequently the aim of this research was to investigate the relationship between mag nocellular function and reading ability at varying levels of the visual system, under systematic variations in parameter levels and with varying methods of assessment, to identify the test that produces the most sensitive relationship between reading ability and magnocellular function in children. An investigation into Random Dot Kinematogram (RDK) parameter levels in Studies 1 and 2 found that an integration time threshold with a dot speed of 20âą /s and a contrast of 4% accounted for the largest variance in reading ability. In Study
processing read ability effect test sensitivity read difficulty continuously evolve plethora suggest cause suggest cause abnormality visual system visual confusion people read difficulty however failure replicate finding lead disregard theory controversy part attributable range processing level within visual system range parameter level use study assess function consequently aim_investigate relationship function read ability varying level visual system systematic variation parameter level vary method assessment identify test produce sensitive relationship read ability function child investigation random dot parameter level studies find integration time threshold dot speed contrast account large variance reading ability study