Pediatrics-Neurology

Publication Detail

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Evaluating reverse speech as a control task with language-related gamma activity on electrocorticography.

Erik C Brown; Otto Muzik; Robert Rothermel; Naoyuki Matsuzaki; Csaba Juhász; Aashit K Shah; Marie D Atkinson; Darren Fuerst; Sandeep Mittal; Sandeep Sood; et al. (Profiled Authors: Sandeep Mittal; Vaibhav Atmanand Diwadkar; Csaba Juhasz; Otto Muzik; Eishi Asano; Aashit Kanubhai Shah; Sandeep Sood)

MD-PhD Program, School of Medicine, Wayne State University, Detroit, MI 48201, USA.
NeuroImage 2012;60(4):2335-45.

Reverse speech has often been used as a control task in brain-mapping studies of language utilizing various non-invasive modalities. The rationale is that reverse speech is comparable to forward speech in terms of auditory characteristics, while omitting the linguistic components. Thus, it may control for non-language auditory functions. 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. We attempted to externally validate a reverse speech control task using intracranial electrocorticography (ECoG) in eight patients with intractable focal epilepsy. We studied adolescent and adult patients who underwent extraoperative ECoG prior to resective epilepsy surgery. All patients received an auditory language task during ECoG recording. Patients were presented 115 audible question stimuli, including 30 reverse speech trials. Reverse speech trials more strongly engaged bilateral superior temporal sites than did the corresponding forward speech trials. Forward speech trials elicited larger gamma-augmentation at frontal lobe sites not attributable to sensorimotor function. Other temporal and frontal sites of significant augmentation showed no significant difference between reverse and forward speech. Thus, we failed to validate reported evidence of weaker activation of temporal neocortices during reverse compared to forward speech. Superior temporal lobe engagement may indicate increased attention to reverse speech. Reverse speech does not appear to be a suitable task for the control of non-language auditory functions on ECoG.

2 Originating Grant

• 1.

  ASANO, EISHI

  Functional brain mapping in pediatric neurosurgery

  1 March 2009 - 28 February 2014

  NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE

  Total Funding: $ 1,578,150

• 2.

  Asano, Eishi

  Quantitative multimodal analyses in pediatric epilepsy surgery

  1 July 2004 - 30 April 2009

  NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE

  Total Funding: $ 768,496

Scientific Context

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