Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 102, Issue 34, Pages 12236-12241Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0502843102
Keywords
pulvinar; lateral geniculate nucleus; medial dorsal nucleus; medial geniculate nucleus; ventral posterior nucleus
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Funding
- NEI NIH HHS [EY 08217, R01 EY008217, R01 EY011409] Funding Source: Medline
- PHS HHS [WY 11409] Funding Source: Medline
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There is a strong correlation between the behavior of an animal and the firing mode (burst or tonic) of thalamic relay neurons. Certain differences between first- and higher-order thalamic relays (which relay peripheral information to the cortex versus information from one cortical area to another, respectively) suggest that more bursting might occur in the higher-order relays. Accordingly, we recorded bursting behavior in single cells from awake, behaving rhesus monkeys in first-order (the lateral geniculate nucleus, the ventral posterior nucleus, and the ventral portion of the medial geniculate nucleus) and higher-order (pulvinar and the medial dorsal nucleus) thalamic relays. We found that the extent of bursting was dramatically greater in the higher-order than in the first-order relays, and this increased bursting correlated with lower spontaneous activity in the higher-order relays. If bursting effectively signals the introduction of new information to a cortical area, as suggested, this increased bursting may be more important in corticocortical transmission than in transmission of primary information to cortex.
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