A 35-year-old man from Bangalore presents with a 2-month history of palpitations, tremor, heat intolerance, and weight loss despite good appetite. On examination, he has a warm, moist skin, resting heart rate of 110 bpm, and a non-tender, diffuse thyroid enlargement with an audible bruit. Serum TSH is <0.1 mIU/L (suppressed), free T4 is 28 pmol/L (elevated), free T3 is 9.2 pmol/L (elevated), and TSI (thyroid-stimulating immunoglobulin) is positive. Which of the following mechanisms best explains the suppressed TSH in the presence of elevated thyroid hormones?

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