L/M Speed-Matching Ratio Predicts Reading in Children

Abstract

Results suggest that relative L-cone sensitivity within the MC-pathway may limit orthographic reading performance.

Pattern-Related Visual Stress, Chromaticity, and Accommodation

“…First, Chase et al 39 measured the subjective speed matches between L-, M-, and S-cone-isolating stimuli in good and poor readers and suggested that differences in L/M-cone ratios in the retina may contribute to reading difficulties. As the L/M ratio influences accommodation, 40 then changing the L/M excitation with color will change the accommodative response.…”

L- and M-Cone Ratios and Magnocellular Sensitivity in Reading

“…Thus, the most immediate and intuitive thought would be that effects depending on L-and M-cone ratios would be mediated by parvocellular neurons. Therefore, the suggestion of Chase et al (2007) that the effect is specific to the magnocellular system is puzzling.…”

“…The most puzzling aspect of the hypothesis of Chase et al (2007), however, is the suggestion that the L-/M-cone ratios are linked to the magnocellular system. They sought to establish this link between the task used and the magnocellular system by way of the middle temporal cortical area (area MT).…”

“…Their paper provides an opportunity to review the possibility of using L-and M-cone stimuli to experimentally isolate the magnocellular system. Chase et al (2007) compared speed-matching data using the L-and M-cone-isolating stimuli to the reading performance of the subjects. This comparison showed a negative correlation between the L-and Mcone ratio and reading performance.…”

The need to differentiate the magnocellular system from the dorsal stream in connection with dyslexia

“…Li et al, 2013. ) To link motion perception to the magnocellular system, as some have sought to do (Chase, Dougherty, Ray, Fowler, & Stein, 2007;Demb, Boynton, Best, et al, 1998;Demb, Boynton, & Heeger, 1997;Heim et al, 2010;Kubova et al, 1996;Solan, Shelley-Tremblay, Hansen, & Larson, 2007;Stein, 2001. Also Eden et al, 1996and Main et al, 2014, interpreted their results relative to the magnocellular system), faces some obstacles.…”