### From NeuroLex

Resource:A general statistical analysis for fMRI data

Name: | Resource:A general statistical analysis for fMRI data |

Description: | The fMRI data was first converted to percentage of whole volume. The statistical analysis of the percentages was based on a linear model with correlated errors. The design matrix of the linear model was first convolved with a hemodynamic response function modelled as a difference of two gamma functions timed to coincide with the acquisition of each slice. Temporal drift was removed by adding a cubic spline in the frame times to the design matrix (one covariate per 2 minutes of scan time), and spatial drift was removed by adding a covariate in the whole volume average. The correlation structure was modelled as an autoregressive process of degree 1. At each voxel, the autocorrelation parameter was estimated from the least squares residuals using the Yule-Walker equations, after a bias correction for correlations induced by the linear model. The autocorrelation parameter was first regularized by spatial smoothing, then used to `whiten' the data and the design matrix. The linear model was then re-estimated using least squares on the whitened data to produce estimates of effects and their standard errors. |

Synonym(s): | FMRI |

Is part of: | McGill University; Montreal; Canada |

Has role: | web accessible database (nlx_res_090910) |

Super-category: | Resource |

URL: | http://www.bic.mni.mcgill.ca/users/keith/ |

*Id: | nif-0000-31974 |

Link to OWL / RDF: | Download this content as OWL/RDF |

## Curation status: Curated

__For Resource Owners:__

A sitemap will keep your NIF Registry description up-to-date and inform search engines about your resource.

Please login to create the sitemap. (top right)

Learn more about what NIF can do for your resource.

Proudly proclaim your inclusion in NIF by displaying the "Registered with NIF" button on your site.
This page uses this default form:Resource

*Note: Neurolex imports many terms and their ids from existing community ontologies, e.g., the Gene Ontology. Neurolex, however, is a dynamic site and any content beyond the identifier should not be presumed to reflect the content or views of the source ontology. Users should consult with the authoritative source for each ontology for current information.

CurationStatus | uncurated + |

DefiningCitation | http://www.bic.mni.mcgill.ca/users/keith/ + |

Definition | The fMRI data was first converted … f effects and their standard errors. |

Has role | Web accessible database (nlx res 090910) + |

Id | nif-0000-31974 + |

Is part of | McGill University; Montreal; Canada + |

Label | Resource:A general statistical analysis for fMRI data + |

ModifiedDate | 18 May 2011 + |

Page has default formThis property is a special property in this wiki. | Resource + |

SuperCategory | Resource + |

Synonym | FMRI + |