In Project 1, the aim is to demonstrate that neural triggering and cycling-off (i.e. initiation and termination of ventilatory assist using EAdi) improve infant-ventilator synchrony, compared to conventional pneumatic trigger systems in pre-term infants with extremely low birth weight. It is hypothesized that neural triggering and cycling-off of mechanical ventilation improves infant-ventilator synchrony. This will be evaluated by comparing the infant's neural timings (inspiratory and expiratory) to ventilator timings, during conventional pressure support ventilation and during neural triggering and cycling-off. We expect that patient-ventilator synchrony will be improved in the neural mode, and that comfort will be lowest with increased asynchrony (conventional modes) and highest with improved infant-ventilator synchrony (neural triggering and cycling-off).