Mark Dow

Visual system mapping
I work on software
for image and functional MRI time
series analysis,
and currently am involved with fMRI projects involving retinotopy and
visual spatial attention.
Segmentation software
tools for
neuroimaging
These include 3-D
surface extraction and
segmentation algorithms, and volume navigation and editing tools that
provide a framework for semi-automatic region of interest generation
and landmark specification. The approach we are developing is based on
edge/surface detection using Gaussian derivative filters,
over-segmentation, and hierarchical region combination. The goal is to
quickly identify primary surfaces, landmarks, and other image based
features, and to use maps
of these features to inform segmentation or parcellation of 3-D images.
Far peripheral human vision
These fMRI
experiments are designed to investigate
the organization, operation, and plasticity of cortical areas involved
in visual processing at large (20-80 degree) eccentricities. We use
light guiding fibers to present flashing stimuli at peripheral
locations during functional imaging. Retinotopically mapped visual
areas and areas that preferentially respond to peripheral visual
stimulation are identified. We are investigating the extent and
organization of these visual areas, and how they are modulated by
spatial attention. Comparison of hearing and congenitally deaf adults
results will elucidate how visual cortical networks are modified and
modulated by profoundly different auditory experience.
These studies are done in collaboration with Greg
Scott and James Dugan.
Geek art, geometric images and the
algorithms that generate them
Geek software
Video
motion estimation and quantification
Space
Software
Scale
Space Edges software
My BDL and Lewis Center for
Neuroimaging stuff
Publications:
Scott, G., Dow, M., Neville, H.
J. (2003). Human
retinotopic mapping of the far periphery.
Society for Neuroscience
2003 poster. [
.pdf ]
Dow, M., Nunnally, R. (2004). An edge based image segmentation
method.
ISMRM 2004 poster. [abstract
.doc ,
poster
.pdf
]
Reports:
Dow, M., Dow, A. (2003). Measuring the
earth's shape: Maximum solar
elevation observations, through space and time. [
.ppt (13
MB)] [print/high res. version:
.ppt
(32 MB)]
Dow, M. (2005). LCNI science meeting 2/9/05: BOLD localization of short
visual events. [
.ppt
(8 MB)]
miscellaneous, BDL and LCNI:
Some of my other stuff
Miscellaneous
Mark's photos
Family and friends
Other people's great
stuff
The Geometry
Junkyard
Sean Michael Ragan,
great ideas
Enzymind, Peter's online Laboratory
(currently in development). My
blog on this site, only occasinally.
deviantART, great art,
searchable. Here are a few of my favorites.
Mathematical
imagery, Jos Leys
The
Brain From
Top To Bottom, tour of human brain functional neuroanatomy
fMRI 4
Newbies, tutorials
Tatjana van Vark's instuments,
particularly her
The Harmonium for
mechanical Fourier analysis and synthesis
Making Art the Otto
Lange Way (I recommend subscribing to the blog through email)
Some great free software
World Wind, virtual
spherical navigation
MRIcron,
Chris Rorden's free, great volume display software
IrfanView,
Irfan
Skiljan's free, great 2-D image software
Nvu, free, great web
page
generation, web authoring software
Google Desktop, hard drive
indexed search
MRIConvert,
Jolinda Smith's free, great GUI batch DICOM file conversion program
Greased
Lightbox, a user script that enhances browsing on websites that
link to images
Some great books