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neurons
stimulus
motor
visual
cortical
brain
memory
subjects
left
task
synapses
ltp
glutamate
synaptic
neurons
activated
tyrosine phosphorylation
activation
phosphorylation
kinase
surface
tip
image
sample
device
p53
cell cycle
activity
cyclin
regulation
proteins
protein
binding
domain
domains
rna
dna
rna polymerase
cleavage
site
materials
organic
polymer
polymers
molecules
computer
problem
information
computers
problems
receptor
receptors
ligand
ligands
apoptosis
science
scientists
says
research
people
amino acids
cdna
sequence
isolated
protein
research
funding
support
nih
program
physicists
particles
physics
particle
experiment
laser
optical
light
electrons
quantum
sequence
sequences
genome
dna
sequencing
surface
liquid
surfaces
fluid
model
wild type
mutant
mutations
mutants
mutation
stars
astronomers
universe
galaxies
galaxy
enzyme
enzymes
iron
active site
reduction
reaction
reactions
molecule
molecules
transition state
united states
women
universities
students
education
cells
cell
expression
cell lines
bone marrow
magnetic
magnetic field
spin
superconductivity
superconducting
plants
plant
gene
genes
arabidopsis
pressure
high pressure
pressures
core
inner core
mantle
crust
upper mantle
meteorites
ratios
bacteria
bacterial
host
resistance
parasite
sun
solar wind
earth
planets
planet
fossil record
birds
fossils
dinosaurs
fossil
development
embryos
drosophila
genes
expression
mice
antigen
t cells
antigens
immune response
gene
disease
mutations
families
mutation
species
forest
forests
populations
ecosystems
virus
hiv
aids
infection
viruses
earthquake
earthquakes
fault
images
data
co2
carbon
carbon dioxide
methane
water
ancient
found
impact
million years ago
africa
genetic
population
populations
differences
variation
patients
disease
treatment
drugs
clinical
cells
proteins
researchers
protein
found
ozone
atmospheric
measurements
stratosphere
concentrations
volcanic
deposits
magma
eruption
volcanism
climate
ocean
ice
changes
climate change
FIGURE 4.7
: A portion of the topic graph learned from the 16,351 OCR ar-
ticles from Science (1990-1999). Each topic node is labeled with its five most
probable phrases and has font proportional to its popularity in the corpus.
(Phrases are found by permutation test.) The full model can be browsed with
pointers to the original articles at
http://www.cs.cmu.edu/ lemur/science/
and on STATLIB. (The algorithm for constructing this graph from the co-
variance matrix of the logistic normal is given in (9).)
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