Effect of the strength of feedforward and feedback connections on the MEG waveform. (\(\bf A\)) Simulations show that the increase of the strength of feedforward connections predominantly affects the P50 deflection. The strengths of the feedback and intra-field connections were kept constant. (\(\bf B\)) The increase of the strength of feedback connections while maintaining the strengths of the feedforward and intra-field connections leads to a noticeable increase of the M100 deflection with only a slight modification of the P50.—In both simulations, the corresponding weights of the \(\bf{K}\) matrix were altered in steps of 5, covering the same absolute range from \(-5\) (blue) to \(-50\) (red) for feedforward connections (A) resp. from \(5\) (blue) to \(50\) (red) for feedback connections (B). The thick blue line in (A) and the thick green line in (B) correspond to the simulated waveform (thick blue line) presented in Figure \ref{fig:MEG_wave}B, for which feedforward values were \(-5\), feedback values \(30\), and intra-field values \(-20\).