To assess PAC, we calculated circular-linear correlations 73. This method allowed us to examine the relationship between circular phase and linear amplitude variables across trials by linearizing the phase variable into sin and cos components and computing a single correlation coefficient according to the following formula: ρϕa=rca2+rsa2−2rcarsarcs1−rcs2rca=c(cosϕ[n],a[n])rsa=c(sinϕ[n],a[n])rcs=c(sinϕ[n],cosϕ[n])c(x,y)=Pearsoncorrelationbetweenxandyϕ[n]=instantaneousphasea[n]=instantaneousanalyticamplitude
