Strata in Neurocognitive Perspective
Elissa D. Asp [+]
Saint Mary's University
This chapter reviews evidence that suggests current and on-going relevance of stratal perspectives for understanding neurocognition but also highlights research which suggests revisions to stratal models. Stratified perspectives appear at the heart of many neuroscience models of speech processing and are at least partially supported by evidences from neurostructural damage and neurophysiologyical evidences derived from imaging. However, neurophysiological evidence also suggests that brains are, in some ways, less ‘tidy’ in their activity patterns than the elegant models we make. They allow both feedback and feed forward activity and even formerly ‘unimodal’ sensory areas allow input from networks associated with other modalities. So, for example, motor representations of articulation may support auditory decoding, auditory perception may be influenced by visual stimuli and so on. SFL as a stratified systems model – where selections on one stratum predict or activate selections on adjacent strata – may be particularly valuable in research investigating such ‘bottom up’ and ‘top down’ modulations in hierarchical generative paradigms for speech and discourse production and comprehension.