Forward speech trials elicited larger gamma-augmentation at frontal lobe sites not attributable to sensorimotor function. Reverse speech trials more strongly engaged bilateral superior temporal sites than did the corresponding forward speech trials. Patients were presented 115 audible question stimuli, including 30 reverse speech trials. All patients received an auditory language task during ECoG recording. We studied adolescent and adult patients who underwent extraoperative ECoG prior to resective epilepsy surgery. We attempted to externally validate a reverse speech control task using intracranial electrocorticography (ECoG) in eight patients with intractable focal epilepsy. This finds some support in fMRI studies indicating that reverse speech resulted in less blood-oxygen-level-dependent (BOLD) signal intensity in perisylvian regions than forward speech. Thus, it may control for non-language auditory functions. The rationale is that reverse speech is comparable to forward speech in terms of auditory characteristics, while omitting the linguistic components. Reverse speech has often been used as a control task in brain-mapping studies of language utilizing various non-invasive modalities.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |