Elsevier

Cortex

Volume 79, June 2016, Pages 155-158
Cortex

Letter to the Editor
A few remarks on the utility of visual motion perception to assess the integrity of the magnocellular system or the dorsal stream

https://doi.org/10.1016/j.cortex.2016.03.006Get rights and content

Abstract

It has been proposed that visual motion perception may be used to assess magnocellular or dorsal stream integrity. It is here pointed out, based on recently published data from dyslexic readers, that it is possible for deficient motion perception to exist without there being deficiencies in neither the magnocellular system nor in the dorsal stream. This makes it difficult to rely upon tests of motion perception to assess the integrity of these structures.

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Acknowledgement

I am indebted to Dr. John Skoyles for comments on an earlier version of the manuscript.

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      A third koniocellular pathway has also been identified (Casagrande, 1994; Hendry and Yoshioka, 1994; Hendry and Reid, 2000; Kaas et al., 1978) but its precise functional role is yet to be fully elucidated (see Roe et al., 2012 for review). It is not uncommon for the subcortical magnocellular and parvocellular pathways to be conflated with the cortical dorsal and ventral processing streams (Skottun, 2015, 2016). For many years, the magnocellular and parvocellular pathways were thought to provide major feedforward input to the dorsal and ventral processing streams, respectively (Livingstone and Hubel, 1988; Merigan and Maunsell, 1993; Zeki and Shipp, 1988).

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