Table 4. Significant differences between temperament types in the abundance of selected excitatory and inhibitory neurotransmitters in the prefrontal cortex.

Temperament type	Glutamic acid		Aspartic acid		GABA (4-amino-Butanoic acid)
fearful/neophobic-alert	↓		↓		↓
interested-stressed		↓		↓
outgoing/neophilic-alert	↑	↑	↑
uninterested-calm	↑		↑	↑	↑
indistinct	↑				↑

Significant differences (p < 0.05) between temperament types are indicated by arrows.