Negative BOLD fMRI Response in the Visual Cortex Carries Precise Stimulus-Specific Information
Author Information
Author(s): Bressler David, Spotswood Nicole, Whitney David
Primary Institution: University of California Davis
Hypothesis
Can negative BOLD responses in the visual cortex carry meaningful, stimulus-specific information?
Conclusion
The study demonstrates that negative BOLD responses in the visual cortex can provide precise information about object position.
Supporting Evidence
- Negative BOLD responses can discriminate objects separated by less than 0.5 degrees.
- Subjects were able to classify stimuli with increasing separation between Gabors.
- Negative BOLD responses were found to be highly selective for object position.
Takeaway
Even when the brain shows a negative response to something we see, it can still tell us important details about that thing's position.
Methodology
The study used fMRI to measure BOLD responses while subjects viewed flickering Gabor stimuli at different positions.
Limitations
The physiological origin of the negative BOLD signal remains unclear.
Participant Demographics
Seven subjects participated in the study.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.01
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website