Behavioral and Brain Functions
Volume 4

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Dockstader C
Gaetz W
Cheyne D
Wang F
Castellanos FX
Tannock R

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Cheyne D
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Tannock R
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MEG event-related desynchronization and synchronization deficits during basic somatosensory processing in individuals with ADHD

Colleen Dockstader¹ , William Gaetz² , Douglas Cheyne¹^,2 , Frank Wang¹ , F Xavier Castellanos³ and Rosemary Tannock¹^,4

¹Neurosciences and Mental Health Program, The Hospital for Sick Children, Toronto, Canada

²Department of Diagnostic Imaging, The Hospital for Sick Children, Toronto, Canada

³Child Study Center, New York University, New York, USA

⁴Human Development & Applied Psychology, Ontario Institute for Studies in Education, Toronto, Canada

author email corresponding author email

Behavioral and Brain Functions 2008, 4:8doi:10.1186/1744-9081-4-8


Published:	12 February 2008

Additional files

Additional file 1:

Example of a control subject's SAM peak locations and values during control (SAM peak value = 2.0) and active (SAM peak value = 16.3) states in somatosensory cortex

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Additional file 2:

Example of an ADHD subject's SAM peak locations and values during control (SAM = 1.3) and active (SAM peak value = 15.0) states in somatosensory cortex

Format: PDF Size: 523KB Download file

This file can be viewed with: Adobe Acrobat Reader

Additional file 3:

Control SI Frequency and Power Dynamics During Predicted versus Random Presentation of a Somatosensory Stimulus (A). Grand Mean TFR of the individual, virtual channel, spatially-filtered single trials for control subjects during Predicted presentation of a stimulus. The plot was baselined using the average spectral energy observed in the pre-stimulus period (-100 – 0 ms). (B) Grand Mean TFR of the individual, virtual channel, spatially-filtered single trials for control subjects during Random presentation of a stimulus. (C) Mean TFR differences between conditions. (D) Statistically significant values remaining once condition differences were thresholded to p </= 0.05.

Format: PDF Size: 566KB Download file

This file can be viewed with: Adobe Acrobat Reader

Additional file 4:

ADHD SI Frequency and Power Dynamics During Predicted versus Random Presentation of a Somatosensory Stimulus (A). Grand Mean TFR of the individual, virtual channel, spatially-filtered single trials for subjects with ADHD during Predicted presentation of a stimulus. The plot was baselined using the average spectral energy observed in the pre-stimulus period (-100 – 0 ms). (B) Grand Mean TFR of the individual, virtual channel, spatially-filtered single trials for subjects with ADHD during Random presentation of a stimulus. (C) Mean TFR differences between conditions. (D) Statistically significant values remaining once condition differences were thresholded to p </= 0.05.

Format: PDF Size: 556KB Download file

This file can be viewed with: Adobe Acrobat Reader

Additional file 5:

Control SII Frequency and Power Dynamics During Predicted versus Random Presentation of a Somatosensory Stimulus (A). Grand Mean TFR of the individual, virtual channel, spatially-filtered single trials for control subjects during Predicted presentation of a stimulus. The plot was baselined using the average spectral energy observed in the pre-stimulus period (-100 – 0 ms). (B) Grand Mean TFR of the individual, virtual channel, spatially-filtered single trials for control subjects during Random presentation of a stimulus. (C) Mean TFR differences between conditions. (D) Statistically significant values remaining once condition differences were thresholded to p </= 0.05.

Format: PDF Size: 574KB Download file

This file can be viewed with: Adobe Acrobat Reader

Additional file 6:

ADHD SII Frequency and Power Dynamics During Predicted versus Random Presentation of a Somatosensory Stimulus (A). Grand Mean TFR of the individual, virtual channel, spatially-filtered single trials for subjects with ADHD during Predicted presentation of a stimulus. The plot was baselined using the average spectral energy observed in the pre-stimulus period (-100 – 0 ms). (B) Grand Mean TFR of the individual, virtual channel, spatially-filtered single trials for subjects with ADHD during Random presentation of a stimulus. (C) Mean TFR differences between conditions. (D) Statistically significant values remaining once condition differences were thresholded to p </= 0.05.

Format: PDF Size: 566KB Download file

This file can be viewed with: Adobe Acrobat Reader