View
201
Download
3
Category
Tags:
Preview:
DESCRIPTION
For insight into helping treat autism with neurofeedback the connectivity work of William Hudspeth has been shown to be helpful. To help therapists with understanding this analysis I put together this PowerPoint presentation.
Citation preview
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Overview of the Hudspeth Connectivity Analysis
Gary J. Schummer, Ph.D.
Neuropsychologist
Clinical Director of the A.D.D. Treatment Center
Torrance, California, U.S.A.
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Typical Connectivity Report
Page 1 – The patient identification,
referral issue, test date, and an
intelligently chosen sample of EEG
xxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxx
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Typical Connectivity Report
Page 1 – ID, referral issue, date, an
intelligently chosen sample of EEG
Page 2 – An analysis of the raw data
with the eyes closed
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Typical Connectivity Report
Page 1 – ID, referral issue, date, an
intelligently chosen sample of EEG
Page 2 – Analysis of data eyes closed
Page 3 – A database comparison in
the eyes closed condition
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Typical Connectivity Report
Page 1 – ID, referral issue, date, an
intelligently chosen sample of EEG
Page 2 – Analysis of data eyes closed
Page 3 – A database comparison in
the eyes closed condition
Page 4 – An analysis of the raw data
with the eyes open
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Typical Connectivity Report
Page 1 – ID, referral issue, date, an intelligently chosen sample of EEG
Page 2 – Analysis of data eyes closed
Page 3 – A database comparison in the eyes closed condition
Page 4 – Analysis of data eyes open
Page 5 – A database comparison in the eyes open condition
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
“Normal” Connectivity Report (Raw, Adult)
EigenImage (From EO Norm)
EigenImages
Derived from 3-dimensional
Principle Component’s Analysis
There are 4 principle components that account for the variance; 3 of the 4 sources of variance are able to be illustrated, the 4th is unknown:
1. Horizontal
2. Sagittal
3. Coronal
4. Unknown
.5 - 3.5 3.5 - 7 7 - 13 13 – 22 .5 – 22 Hz Hz Hz Hz Hz
Hudspeth Frequency Range Definitions
Horizontal – view from above (Cz) Sagittal – view from right side (T4) Coronal – view from in front (Fpz)
Views or Factors
New metric – shared variance between the percent distance of the vectors of the frontal areas. A measurement of how well the frontal areas are holding together Percent
The lower the number from the norm (~25-32%) the more the frontal sites cluster together and indicate hypercoherence
As the difference between a percentage approaches 10 (compared to its 4 neighbors) the greater the liklihood that the data for that frequency are invalid “norms” are in development
Midlines – 1 horizontal, 1 vertical per factor and per band
Normal
Abnormal Able to treat
Invalid Unable to treat
r2 =The amount of variance explained by the Horizontal, Sagittal, and Coronal factors expressed as a percentage The higher the percentage, the better
“Total” is typically lowest
r2 – sum of factors
Indication of likely source of artifact or site that
is highly deviant
Note – these do not appear in a “normal” image
These could be valid, but it’s a hint to check the
raw EEG for artifact
Note F7 and F8 are typical areas of muscle tension
Invalid Unable to treat
May indicate the source of the invalidity
Note T5
QUESTIONS ABOUT THE EIGENIMAGE ??
% Shared Variance
What it’s NOT:
– NOT derived from the same computation as the EigenImages
– NOT a 3- dimensional analyses
– NOT derived from Principle Components Analysis
% Shared Variance
What it is:
A multivariate measure of coherence within a 2-dimensional plane
Hudspeth’s “% Shared Variance” measures are more similar to the coherence readings given in NxLink and Neuroguide than they are to the EigenImages
Of course, there will be similarities between the EigenImages and the %Shared Variance
Intra (hemispheric) - each site’s percent of shared variance with 7 sites in the same hemisphere including the 3 midline sites; total 10
Inter (hemispheric) - each site’s percent of shared variance with all 8 sites in the opposite hemisphere
Each Midline site is compared with all other sites; total of 18
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Each Midline site
Fz
Cz
Pz
TOTAL Intrahemispheric
% Shared Variance
is compared with the other 18 sites
Fz
Each Midline site
TOTAL Intrahemispheric
% Shared Variance
Fz-Fp2
To give a number which indicates the strength of that site, relative to the other 18
Each Midline sight is compared with all other sites; total of 18
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Each Midline sight is compared with all other sites; total of 18
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Each Midline sight is compared with all other sites; total of 18
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Intra (hemispheric) - each site’s percent of shared variance with 7 sites in the same hemisphere including the 3 midline sites; total 10
Inter (hemispheric) - each site’s percent of shared variance with all 8 sites in the opposite hemisphere
Each Midline sight is compared with all other sites; total of 18
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
Intra (hemispheric) - each site’s percent of shared variance with 7 sites in the same hemisphere including the 3 midline sites; total 10
Inter (hemispheric) - each site’s percent of shared variance with all 8 sites in the opposite hemisphere
Each Midline sight is compared with all other sites; total of 18
Copyright © 2008 Gary J. Schummer PhD APC., and Brain Potential Inc. Unauthorized duplication or distribution is illegal.
% Shared Variance From EO Normal
Note the outside percentages are typically lower than sites closer to the midline - because they have fewer “neighbors”
Z-Score comparison to the database
Z-Score comparison expressed as a percentile
Intra – each site’s Z-Score or Percentile relative to the other 7 sites in the same hemisphere plus the 3 midline sites (Total of 10)
Inter – each site’s Z-Score or Percentile relative to the 8 sites in the opposite hemisphere
Midline sites are compared with all other sites (Total of 18)
Questions?
Recommended