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		<title>Rats Emit Distinct 40 kHz Ultrasonic Calls While Eating Chocolate</title>
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		<pubDate>Sun, 25 Oct 2026 11:04:50 +0000</pubDate>
				<category><![CDATA[Biology]]></category>
		<category><![CDATA[chocolate]]></category>
		<category><![CDATA[endogenous opioid system]]></category>
		<category><![CDATA[eNeuro]]></category>
		<category><![CDATA[food reward]]></category>
		<category><![CDATA[hedonic state]]></category>
		<category><![CDATA[Machine Learning]]></category>
		<category><![CDATA[naloxone]]></category>
		<category><![CDATA[palatability]]></category>
		<category><![CDATA[rats]]></category>
		<category><![CDATA[reward]]></category>
		<category><![CDATA[ultrasonic vocalizations]]></category>
		<category><![CDATA[University of Fukui]]></category>
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					<description><![CDATA[University of Fukui researchers identified a 40 kHz inverted-U ultrasonic vocalization in rats that occurs during chocolate consumption, is reduced by opioid receptor blockade, and may serve as a real-time, non-invasive signal of food-related pleasure.]]></description>
		
		
		
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