Seeing problems that may not exist: A reply to West et al.'s (2018) questioning of the procedural deficit hypothesis.

In a recent paper ("The procedural learning deficit hypothesis of language learning disorders: We see some problems", Developmental Science, 2018), West, Vadillo, Shanks, and Hulme (2018) aimed to test the procedural deficit hypothesis (PDH) of specific language impairment (SLI) and dyslexia. This hypothesis proposes that abnormalities of brain structures underlying procedural memory can largely explain SLI, and perhaps developmental dyslexia (Ullman, 2004; Ullman & Pierpont, 2005; see also Nicolson & Fawcett, 2007, 2011). This article is protected by copyright. All rights reserved.