In the early years of convulsion therapy, cure was not always expected. Some patients improved, then relapsed – predictably. Their recoveries followed a pattern, not just in effect but in timing. In 1940, Shepley and McGregor recognised this clinical regularity and responded with an unusual proposal: deliver electroconvulsive therapy (ECT) every two weeks, indefinitely. The convulsion was no longer an acute intervention – it became a scheduled act of preservation. They called it ‘indefinitely prolonged maintenance treatment’, a model that would not gain widespread traction for decades.

This was not a theory. It was an observation. Shepley and McGregor observed that for certain patients relapse followed a precise interval – often within a fortnight. Treatment, they concluded, should anticipate recurrence rather than wait for it. Long before mood stabilisers or depot antipsychotics, they introduced what we now call maintenance care.

But regular repetition required more than theory – it demanded tolerability. Cardiazol, the earlier chemical convulsant, produced terror and vomiting. Patients fled treatment. ECT, by contrast, was quieter. Administered under anaesthesia, it allowed the seizure to occur without the conscious distress of anticipation. Fear was not just reduced – it was structurally removed. The design of the treatment shaped its ethical possibilities.

Shepley and McGregor’s technical precision supported this shift. They detailed the use of saline-soaked gauze pads, consistent scalp resistance (typically between 100 and 800 ohms) and a voltage calibrated to produce reliable clonic seizures without exceeding 150 volts. Later refinements by Grey Walter, and De Wet’s 1955 emphasis on reproducibility, further advanced this ethic of tolerability. The machines from the outset were instruments not only of electricity but of careful calibration – tools for harm reduction as much as symptom relief.

Norman P. Moore, writing in 1943, acknowledged that while ECT often failed to cure chronic psychosis, it could delay relapse if administered regularly. Valentine, in 1949, even proposed daily ECT regimens when tolerated. Repetition was becoming part of the therapeutic logic and with it a slow reimagining of care as something sustained rather than singular.

Page, in 1941, noted behavioural suppression in animals subjected to repeated seizures: passivity, loss of initiative, flattening. The act of repetition, clinicians suspected, did more than treat episodes; it modulated the trajectory of the self.

We often speak of psychiatric history as a linear ascent towards better interventions. But this was a moment of clinical foresight, not technological excess. An early recognition that for some care had to recur gently, predictably and indefinitely.

What Shepley and McGregor offered was not just treatment but attention to timing. A willingness to observe recurrence and to meet it halfway. Every 14 days. Not just rhythm – anticipation.