Head direction cells efference copy") preparing the network for an impending head turn. HD cells continue to fire in an organized manner during sleep, as if animals were awake. However, instead of always pointing toward the same direction—the animals are asleep and thus immobile—the neuronal "compass needle" moves constantly. In particular, during rapid eye movement sleep, a brain state rich in dreaming activity in humans and whose electrical activity is virtually indistinguishable from the waking brain, this directional signal moves as if the animal is awake: that is, HD neurons are sequentially activated, and the individual neurons representing a common direction during wake
General Data Format for Biomedical Signals BioSig library provides implementations for reading and writing of GDF in GNU Octave/MATLAB and C/C++. A lightweight C++ library called libGDF is also available and implements version 2 of the GDF format. General Data Format for Biomedical Signals The General Data Format for Biomedical Signals is a scientific and medical data file format. The aim of GDF is to combine and integrate the best features of all biosignal file formats into a single file format. The original GDF specification was introduced in 2005 as a new data format to overcome some of the limitations of the European Data Format for