Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.

In this paper we explore conventional techniques for estimating the time lag between two signals, using both time and frequency domain measures. We generate test signals to illustrate that in general, estimated temporal relationships between neural sites connected by multiple pathways are ambiguous except in special cases where multidirectional flow of information can be ruled out a priori. Signals are analyzed using the cross correlogram in the time domain, and coherence, phase and directed transfer function (DTF) in the frequency domain. In particular, we show how similar phase and DTF measures can be obtained from qualitatively different dynamical situations (uni and bi-directional flow), and argue that although the phase and DTF combined provide more directionality information than phase alone, one still needs to observe caution if one suspects multidirectional flow.

Type

Journal article

Journal

J Neurosci Methods

Publication Date

15/07/2003

Volume

127

Pages

95 - 103

Keywords

Models, Neurological, Normal Distribution, Statistics as Topic, Time Factors