D’Ambrosio M., Bracco F. & Benso F.
According to the main explanatory models on stuttering, specific cognitive functions are involved in speech planning and in fluency management. In general, they are based on cognitive architectures formed by modules, processes and function controls, aimed at resource management and regulation. Even when not explicitly stated, these models refer to the Supervisory Attentional System (SAS, Norman & Shallice, 1986) for speech management. As a result of this approach, the Hierarchical Modular Model (HMM) has recently been proposed to describe the interaction between the SAS and the specific language systems in stuttering and verbal fluency (D’Ambrosio, Bracco, Benso, 2013). This model is grounded on a three-level hierarchical modular approach (Moscovitch & Umiltà, 1990). According to the HMM, only the first level modules, the simplest ones, are similar to those described by Fodor, while the second and third level modules are less computationally encapsulated and are the result of SAS management. These modules can control learned automatic behaviours. This model acknowledges a relevant role of central and executive functions in fluency learning and regulation. leggi tutto