Analysis of fMRI time-series revisited--again - PubMed (original) (raw)
Comment
Analysis of fMRI time-series revisited--again
K J Worsley et al. Neuroimage. 1995 Sep.
Abstract
Friston et al. (1995, NeuroImage 2:45-53) presented a method for detecting activations in fMRI time-series based on the general linear model and a heuristic analysis of the effective degrees of freedom. In this communication we present corrected results that replace those of the previous paper and solve the same problem without recourse to heuristic arguments. Specifically we introduce a proper and unbiased estimator for the error terms and provide a more generally correct expression for the effective degrees of freedom. The previous estimates of error variance were biased and, in some instances, could have led to a 10-20% overestimate of Z values. Although the previous results are almost correct for the random regressors chosen for validation, the present theoretical results are exact for any covariate or waveform. We comment on some aspects of experimental design and data analysis, in the light of the theoretical framework discussed here.
Comment on
- Analysis of fMRI time-series revisited.
Friston KJ, Holmes AP, Poline JB, Grasby PJ, Williams SC, Frackowiak RS, Turner R. Friston KJ, et al. Neuroimage. 1995 Mar;2(1):45-53. doi: 10.1006/nimg.1995.1007. Neuroimage. 1995. PMID: 9343589
Similar articles
- Analysis of fMRI time-series revisited.
Friston KJ, Holmes AP, Poline JB, Grasby PJ, Williams SC, Frackowiak RS, Turner R. Friston KJ, et al. Neuroimage. 1995 Mar;2(1):45-53. doi: 10.1006/nimg.1995.1007. Neuroimage. 1995. PMID: 9343589 - A general statistical analysis for fMRI data.
Worsley KJ, Liao CH, Aston J, Petre V, Duncan GH, Morales F, Evans AC. Worsley KJ, et al. Neuroimage. 2002 Jan;15(1):1-15. doi: 10.1006/nimg.2001.0933. Neuroimage. 2002. PMID: 11771969 - Mixed-effects and fMRI studies.
Friston KJ, Stephan KE, Lund TE, Morcom A, Kiebel S. Friston KJ, et al. Neuroimage. 2005 Jan 1;24(1):244-52. doi: 10.1016/j.neuroimage.2004.08.055. Neuroimage. 2005. PMID: 15588616 - To smooth or not to smooth? Bias and efficiency in fMRI time-series analysis.
Friston KJ, Josephs O, Zarahn E, Holmes AP, Rouquette S, Poline J. Friston KJ, et al. Neuroimage. 2000 Aug;12(2):196-208. doi: 10.1006/nimg.2000.0609. Neuroimage. 2000. PMID: 10913325 Review. - [Data processing of functional magnetic resonance of brain based on statistical parametric mapping].
Li W, Wang H. Li W, et al. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2007 Apr;24(2):477-80. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2007. PMID: 17591287 Review. Chinese.
Cited by
- A neural signature of affiliative emotion in the human septohypothalamic area.
Moll J, Bado P, de Oliveira-Souza R, Bramati IE, Lima DO, Paiva FF, Sato JR, Tovar-Moll F, Zahn R. Moll J, et al. J Neurosci. 2012 Sep 5;32(36):12499-505. doi: 10.1523/JNEUROSCI.6508-11.2012. J Neurosci. 2012. PMID: 22956840 Free PMC article. Clinical Trial. - The effects of focal epileptic activity on regional sensory-evoked neurovascular coupling and postictal modulation of bilateral sensory processing.
Harris S, Bruyns-Haylett M, Kennerley A, Boorman L, Overton PG, Ma H, Zhao M, Schwartz TH, Berwick J. Harris S, et al. J Cereb Blood Flow Metab. 2013 Oct;33(10):1595-604. doi: 10.1038/jcbfm.2013.115. Epub 2013 Jul 17. J Cereb Blood Flow Metab. 2013. PMID: 23860375 Free PMC article. - From novel to familiar: tuning the brain for metaphors.
Cardillo ER, Watson CE, Schmidt GL, Kranjec A, Chatterjee A. Cardillo ER, et al. Neuroimage. 2012 Feb 15;59(4):3212-21. doi: 10.1016/j.neuroimage.2011.11.079. Epub 2011 Dec 4. Neuroimage. 2012. PMID: 22155328 Free PMC article. - The amplitude and timing of the BOLD signal reflects the relationship between local field potential power at different frequencies.
Magri C, Schridde U, Murayama Y, Panzeri S, Logothetis NK. Magri C, et al. J Neurosci. 2012 Jan 25;32(4):1395-407. doi: 10.1523/JNEUROSCI.3985-11.2012. J Neurosci. 2012. PMID: 22279224 Free PMC article. - Tailored haemodynamic response function increases detection power of fMRI in awake dogs (Canis familiaris).
Boch M, Karl S, Sladky R, Huber L, Lamm C, Wagner IC. Boch M, et al. Neuroimage. 2021 Jan 1;224:117414. doi: 10.1016/j.neuroimage.2020.117414. Epub 2020 Oct 1. Neuroimage. 2021. PMID: 33011420 Free PMC article.
Publication types
MeSH terms
LinkOut - more resources
Full Text Sources
Other Literature Sources
Medical