Activation of extrastriate and frontal cortical areas by visual words and word-like stimuli

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Paper (help)
Activation of extrastriate and frontal cortical areas by visual words and word-like stimuli
Authors: Steven E. Petersen, Peter T. Fox, Abraham Z. Snyder, Marcus E. Raichle
Citation: Science (New York, N.Y.) 249 (4972): 1041-1044. 1990 August
Database(s): BrainMap: 5070167 PubMed (PMID/2396097)
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Activation of extrastriate and frontal cortical areas by visual words and word-like stimuli reports a functional neuroimaging study with positron emission tomography.

There were 5 states in the experiment

  1. Viewing common nouns (real words)
  2. Viewing nonwords that follow the spelling rules of English (pseudowords)
  3. Viewing orthographically irregular groups of words.
  4. Viewing strings of letter-like forms
  5. Fixation with no stimulus

The study was included in the original BrainMap database as paper #25.

Contents

[edit] Subjects

Subject group #1 (help)
Normal volunteers
Subjects/♂/♀: 8 / 5 / 3
Age: (18–49)
Handedness: Right
Nationality: define nationality
Approval: define approval
Databases:

Group 1 of 8 right-handed normal volunteers with 5 males and 3 females were included in the study. The group was from 18 up to 49 years old.


[edit] Scanning

PET Scanning (help)
Scanner: PETT VI
Radiotracer: Oxygen-15 Water
Laboratory: missing laboratory

Using the radiotracer Oxygen-15-Water PET scans were acquired with a PETT VI.


[edit] Results

The Talairach coordinates are probably in the space of the old Talairach atlas (not the 1988). The statistical method uses the approach described in Fox and Mintun 1989.[1]

There were four different sets of stimuli, but only coordinates for two are available in the article.

[edit] Real word visual stimulation

1 coordinate reported in the caption of Figure 3 and 3 coordinates in footnote 14. In the original BrainMap database four coordinates were available for this contrast.
Experiment #1 : Real word visual stimulation (help)
Description: missing description
Scanning:
Topic: Visual word recognition
Analysis:
Databases:

Anatomy
BA
x
y
z
No. vox
t
z
Coordinate search
Plot
1 Inferior frontal area -29 43 0 Brede Database Brede Wiki NeuroSynth SumsDB Not available
2 29 -65 2 Brede Database Brede Wiki NeuroSynth SumsDB Not available
3 21 -75 2 Brede Database Brede Wiki NeuroSynth SumsDB Not available
4 21 -53 6 Brede Database Brede Wiki NeuroSynth SumsDB Not available
Entry not completed (help)

[edit] Pseudoword visual stimulation

1 coordinate reported in the caption of Figure 3 and 2 coordinates in footnote 14.

The z-coordinate of the third coordinate is strange.
Experiment #2 : Visual pseudoword stimulus (help)
Description: missing description
Scanning:
Topic: Pseudoword visual recognition
Analysis:
Databases:

Anatomy
BA
x
y
z
No. vox
t
z
Coordinate search
Plot
1 Inferior frontal area -28 38 -6 Brede Database Brede Wiki NeuroSynth SumsDB Not available
2 23 -77 4 Brede Database Brede Wiki NeuroSynth SumsDB Not available
3 4 7 -47 Brede Database Brede Wiki NeuroSynth SumsDB Not available
Entry not completed (help)

[edit] Critique

  1. The reporting of peak activations in the paper seems not to be complete.
  2. It is not clear what the baseline is for the contrast with the reported coordinates.
  3. There is something wrong with the third coordinate of the pseudoword contrast.

[edit] References

  1. Peter T. Fox, M. A. Mintun (1989). missing title. J. Nucl. Med. 30(141): missing pages.
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