Cumulative Link Mixed Model fitted with the Laplace approximation

formula: depvar ~ Difficulty * Sound + (1 + Difficulty * Sound | pp) +      (1 | stim)
data:    datafile3

 link  threshold nobs logLik  AIC     niter       max.grad cond.H 
 logit flexible  615  -757.44 1574.88 5857(17701) 8.75e-04 1.4e+03

Random effects:
 Groups Name                          Variance  Std.Dev.  Corr                               
 stim   (Intercept)                   3.465e-11 5.886e-06                                    
 pp     (Intercept)                   1.229e+00 1.109e+00                                    
        Difficulty2Hard               1.547e+00 1.244e+00 -0.469                             
        Sound1quiet                   4.100e-01 6.403e-01 -0.700  0.394                      
        Sound3forward                 4.451e-01 6.672e-01 -0.185  0.855  0.519               
        Difficulty2Hard:Sound1quiet   2.973e+00 1.724e+00  0.707 -0.908 -0.737 -0.823        
        Difficulty2Hard:Sound3forward 1.039e+00 1.019e+00  0.150 -0.910  0.017 -0.731  0.653 
Number of groups:  stim 60,  pp 30 

Coefficients:
                              Estimate Std. Error z value Pr(>|z|)  
Difficulty2Hard               -0.87556    0.40596  -2.157   0.0310 *
Sound1quiet                   -0.02696    0.25966  -0.104   0.9173  
Sound3forward                 -0.16928    0.28065  -0.603   0.5464  
Difficulty2Hard:Sound1quiet    0.15184    0.53502   0.284   0.7766  
Difficulty2Hard:Sound3forward  1.20247    0.52533   2.289   0.0221 *
---
Signif. codes:  0 *** 0.001 ** 0.01 * 0.05 . 0.1   1

Threshold coefficients:
    Estimate Std. Error z value
1|2  -2.7743     0.3012  -9.212
2|3  -1.1942     0.2771  -4.310
3|4   0.6131     0.2727   2.248
