שאלה | Rats were trained to press a bar to get rewarding brain stimulation in the medial forebrain bundle. They were then injected with amphetamine for 2 weeks only. 2 weeks after stopping the amphetamine, the rats were again allowed to press a bar to get the electrical brain stimulation. Which of the statements below is correct?

Rats were trained to press a bar to get rewarding brain stimulation in the medial forebrain bundle. They were then injected with amphetamine for 2 weeks only. 2 weeks after stopping the amphetamine, the rats were again allowed to press a bar to get the electrical brain stimulation. Which of the statements below is correct?

		The rats renewed bar-pressing at the same level of electrical stimulation as they had before.
		The rats pressed the bar for a lower amount of current than that which was required before they received amphetamine.
		The rats pressed the bar only when given more current than was required before they received amphetamine.
		No amount of current could elicit bar-pressing for electrical stimulation through the same electrodes.

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