Fig. 2.

The number of studies and structural methodologies used in neonates (red represents studies on full-term neonates; blue represents studies on both full-term and preterm neonates at term PCA), foetuses, and preterms (Panel a). The number of studies and functional methodologies used in neonates, foetuses, and preterms (without sensory modality [resting state], auditory [linguistic and non-linguistic] visual, tactile, and taste stimuli) (Panel b). DTI diffusion tensor imaging, EP evoked potential, EEG electroencephalogram, fMRI functional magnetic resonance imaging, HARDI high-angular resolution diffusion imaging, MEG magnetoencephalography, MRI magnetic resonance imaging, NIRS near-infrared spectroscopy, OT optical topography, PCA post-conception age, TBM tensor-based morphometry, US ultrasound