Visualizing and quantifying evoked cortical activity assessed with intrinsic signal imaging.

Abstract:

:Intrinsic signal imaging (ISI) measures changes in light reflectance from the illuminated cortex (intrinsic signals or IS) attributed to various vascular and metabolic sources that, when using illumination in the 600 nm range, appear to co-localize with neuronal activity. Given the multiple sources contributing to the collected IS, the common practice of averaging across an extended post-stimulus time epoch before dividing by baseline data typically visualizes evoked IS overlying both the cortical tissue and the large surface blood vessels. In rat PMBSF, the contribution from these vessels are problematic as they do not co-localize with known PMBSF function. Determining a means for quantifying the evoked IS area poses an additional challenge. Here, we describe how exploiting IS collected shortly after stimulus onset (within 1.5 s), which coincides with fast oxygen consumption of active neurons, visualizes evoked IS overlying the cortical tissue without the large surface vessels. We also describe how the use of absolute thresholds combined with a baseline determined from data collected immediately prior to stimulus onset (within 1 s) targets most precisely a specific evoked IS amplitude, a method that should be especially useful when evoked areas are expected to occupy a substantial portion of the total imaged area and/or when peak activity is expected to differ between subjects.

journal_name

J Neurosci Methods

authors

Chen-Bee CH,Polley DB,Brett-Green B,Prakash N,Kwon MC,Frostig RD

doi

10.1016/s0165-0270(00)00180-1

subject

Has Abstract

pub_date

2000-04-15 00:00:00

pages

157-73

issue

2

eissn

0165-0270

issn

1872-678X

pii

S0165027000001801

journal_volume

97

pub_type

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