Speech Communication - Special issue on the nature of speech perception (the psychophysics of speech perception III)
Dissociating Reading Processes on the Basis of Neuronal Interactions
Journal of Cognitive Neuroscience
Cerebellum and Speech Perception: A Functional Magnetic Resonance Imaging Study
Journal of Cognitive Neuroscience
Neural Specialization for Letter Recognition
Journal of Cognitive Neuroscience
Journal of Cognitive Neuroscience
Task-Dependent Modulation of Regions in the Left Inferior Frontal Cortex during Semantic Processing
Journal of Cognitive Neuroscience
Journal of Cognitive Neuroscience
Auditory Cortex Accesses Phonological Categories: An MEG Mismatch Study
Journal of Cognitive Neuroscience
The Role of Segmentation in Phonological Processing: An fMRI Investigation
Journal of Cognitive Neuroscience
Imaging Cognition II: An Empirical Review of 275 PET and fMRI Studies
Journal of Cognitive Neuroscience
Lateralization of Speech and Auditory Temporal Processing
Journal of Cognitive Neuroscience
Strategic allocation of attention reduces temporally predictable stimulus conflict
Journal of Cognitive Neuroscience
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Positron emission tomography (PET) was used to investigate the functional anatomy of auditory and phonological processing. Stimulus sets were designed to determine areas of the brain significantly activated during speech and nonspeech acoustic processing for stimuli with or without rapidly changing acoustic cues. Performance of auditory target detection tasks using these stimulus sets produced increased activation in superior temporal, frontal opercular, and medial frontal (SMA) cortices, relative to a visual fixation control task. While the medial frontal and superior temporal changes are best explained by motor and sensory components of the task, respectively, the frontal opercular changes were dependent upon the task performed upon the auditory input (mere presentation of the stimuli did not result in significant activation). On the left, the frontal opercular increases were larger when subjects performed an auditory detection task upon stimuli that incorporated rapid temporal changes (words, syllables, and tone sequences) than steady-state vowels. A converging study involving performance of orthographic (ascending letter) and phonological (long vowel sound) word discrimination tasks supports anatomical and behavioral evidence suggesting the left frontal opercular region is important for certain types of auditory/temporal analysis, as well as high-level articulatory coding. In addition to the activation increases associated with performance of auditory target detection tasks, decreases in activation were observed bilaterally along the intraparietal sulcus and superior parietal cortex, in the Rolandic sulcus, and the posterior cingulate; these decreases may reflect an attentional shift away from areas involved in the fixation task during the performance of a difficult auditory task. These results demonstrate that focusing more closely on basic neural processing differences (such as temporal integration rates) may lead to a better understanding of the specific neural processes that underlie complex phonological tasks.