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VARIATION: unmerge_d0_5
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model: behavior ~ stim + day + stim:day + (1|rat)   (behavior = success COUNT)
day = training day within window (0 = first analyzed day)
treatment (stim=1): Electrode-Box-B2
control   (stim=0): Electrode-Box-A2
N = 6 rats, 36 sessions   raw day coverage: treat 0..5, control 0..5
(equal day coverage over this window)

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FULL MODEL SUMMARY -- fitlme
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Linear mixed-effects model fit by ML

Model information:
    Number of observations              36
    Fixed effects coefficients           4
    Random effects coefficients          6
    Covariance parameters                2

Formula:
    behavior ~ 1 + day*stim + (1 | rat)

Model fit statistics:
    AIC       BIC       LogLikelihood    Deviance
    289.66    299.16    -138.83          277.66  

Fixed effects coefficients (95% CIs):
    Name                   Estimate    SE        tStat       DF    pValue    
    {'(Intercept)'}         12.524     5.2775      2.3731    32      0.023816
    {'day'        }         9.8571     1.4772      6.6729    32    1.5706e-07
    {'stim'       }        -3.0159     7.4635    -0.40408    32       0.68884
    {'day:stim'   }         5.3619      2.089      2.5667    32      0.015149


    Lower      Upper 
     1.7739    23.274
     6.8482    12.866
    -18.219    12.187
     1.1067    9.6172

Random effects covariance parameters (95% CIs):
Group: rat (6 Levels)
    Name1                  Name2                  Type           Estimate
    {'(Intercept)'}        {'(Intercept)'}        {'std'}        4.8527  


    Lower     Upper 
    1.7069    13.796

Group: Error
    Name               Estimate    Lower     Upper 
    {'Res Std'}        10.703      8.3104    13.785


effect                     t (df)        F (df1)       p
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stim x day (interaction)   t(32)=  2.57  F(1)=   6.588  p=0.01515
day (learning)             t(32)=  6.67  F(1)=  44.528  p=1.571e-07
stim (main, window start)  t(32)= -0.40  F(1)=   0.163  p=0.6888
interaction 95% CI: [+1.11, +9.62]
INTERPRETATION: stim x day interaction SIGNIFICANT positive -- treatment improves FASTER (benefit accumulates) (p=0.01515, slope diff=+5.36)
Paper (N=24): interaction t(227)=2.68, F(1)=7.12, p=0.008.