marginally significantP = 0.0555
2i ), a marginally significant increase in approach speed (EYFP: 3.59 ± 0.28; hM4D: 5.24 ± 0.67; P = 0.0555, unpaired t -test) (Fig. 2j ), an increase in the mean duration of individual investigation (EYFP: 3.04 ± 1.16; hM4D: 7.258 ± 1.446; P = 0.0404, unpaired t -test) (Fig. 2k ), and a less percentage of stretched postures towards stimulus mice (EYFP: 86.22 ± 5.90; hM4D: 49.86 ± 6.71; P = 0.0006, unpaired t -test) (Fig. 2l ).