Table 2.

Two-level hierarchical linear model (see eqs. 1–3) of the firing of striatal head movement related neurons during T2 (after cocaine injection): final estimation of between-neuron fixed effects

S.E. are robust. All the reported values in the table have been rounded. Grand mean dose = 9.68; grand mean average T1FR = 5.02.

Fixed Effect	Parameter	Coefficient	S.E.	ta
Results for within-neuron intercept (β0j)b
Between-neuron intercept (overall mean β0j value)	γ00	6.1108	0.6110	10.00***
Dose	γ01	−0.1101	0.0505	−2.18*
Average T1FR	γ02	1.0537	0.1732	6.08***
Dose2	γ03	−0.0242	0.0079	−3.06**
Dose·average T1FR	γ04	−0.0322	0.0107	−3.00**
Dose2·average T1FR	γ05	−0.0045	0.0020	−2.23*
Results for within-neuron slope (β1j)c
Between-neuron intercept (overall mean β1j value)	γ10	0.1742	0.0671	2.60*
Dose	γ11	−0.0105	0.0040	−2.66*
Average T1FR	γ12	0.0173	0.0073	2.38*
Dose2	γ13	−0.0008	0.0008	−0.98
Dose·average T1FR	γ14	−0.0002	0.0003	−0.66
Dose2·average T1FR	γ15	−0.0002	0.0001	−1.86

^a Approximate df = 102.

^b Ninety-three percent of the variance of β_0j explained.

^c Thirteen percent of the variance of β_1j explained.

^* p < 0.05;

^** p < 0.01;

^*** p < 0.001.