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Effect of stimulation or lesioning of the hypothalamus upon gonadotrophin secretion in the guinea‐pig.

The effect of electrical stimulation of the anterior hypothalamus of the guinea‐pig upon follicle‐stimulating hormone (FSH) and luteinizing hormone (LH) secretion during two phases of the oestrous cycle was examined and compared with the response to electrolytic or radio‐frequency lesions placed in the same area. The secretion of LH was briefly increased by electrical stimulation of the hypothalamus, with a greater response occurring over days 7‐8 (luteal phase) of the oestrous cycle than on days 13‐14 (follicular phase). An equivalent rise in LH output was produced by placement of direct current (d.c.) lesions in the hypothalamus, whereas lesions made with radio‐frequency current produced a small increase only on days 13‐14. The secretion of FSH was not changed by any procedure.