Independent component analysis of high-resolution imaging data identifies distinct functional domains

Jürgen Reidl, Jens Starke, David B. Omer, Amiram Grinvald, Hartwig Spors*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

In the vertebrate brain external stimuli are often represented in distinct functional domains distributed across the cortical surface. Fast imaging techniques used to measure patterns of population activity record movies with many pixels and many frames, i.e., data sets with high dimensionality. Here we demonstrate that principal component analysis (PCA) followed by spatial independent component analysis (sICA), can be exploited to reduce the dimensionality of data sets recorded in the olfactory bulb and the somatosensory cortex of mice as well as the visual cortex of monkeys, without loosing the stimulus-specific responses. Different neuronal populations are separated based on their stimulus-specific spatiotemporal activation. Both, spatial and temporal response characteristics can be objectively obtained, simultaneously. In the olfactory bulb, groups of glomeruli with different response latencies can be identified. This is shown for recordings of olfactory receptor neuron input measured with a calcium-sensitive axon tracer and for network dynamics measured with the voltage-sensitive dye RH 1838. In the somatosensory cortex, barrels responding to the stimulation of single whiskers can be automatically detected. In the visual cortex orientation columns can be extracted. In all cases artifacts due to movement, heartbeat or respiration were separated from the functional signal by sICA and could be removed from the data set. sICA following PCA is therefore a powerful technique for data compression, unbiased analysis and dissection of imaging data of population activity, collected with high spatial and temporal resolution.

Original languageAmerican English
Pages (from-to)94-108
Number of pages15
JournalNeuroImage
Volume34
Issue number1
DOIs
StatePublished - 1 Jan 2007
Externally publishedYes

Bibliographical note

Funding Information:
We thank Rina Hildesheim for synthesizing the voltage-sensitive dyes. We thank Andreas Schaefer, Thomas Kuner, Matt Wachowiak, and Rainer Friedrich for their technical help and discussions. We thank Guo Qingzhu and Thomas Künsting for their help with programming. The work was funded by the Heidelberger Akademie der Wissenschaften (WIN Program), the MPG, the BMBF and ISF.

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