Human hunger as a memory process.

Area of Science:

• Cognitive Neuroscience
• Physiology
• Psychology

Background:

• Current models of hunger lack a general learning and memory (L&M) framework.
• Existing L&M models are limited to palatable foods and do not fully integrate physiological factors.
• The relationship between bodily sensations of hunger and the mental anticipation of eating is not well understood.

Purpose of the Study:

• To propose a novel L&M model of human hunger that integrates physiological influences.
• To explain how learned associations between internal and external cues shape the experience of hunger.
• To elucidate the cognitive mechanisms underlying hunger judgments and their modulation by satiety and biological parameters.

Main Methods:

• The study presents a conceptual L&M model of hunger.
• It outlines how individuals form associations between internal and external cues and food through episodic and semantic memories.
• The model describes how retrieval of these memories, influenced by affective content, contributes to the sensation of hunger.

Main Results:

• Hunger is framed as a cognitive operation learned in childhood, involving the retrieval of food-related memories triggered by associated cues.
• Physiological states like satiety acutely inhibit these memory processes, demonstrating how biology modulates hunger.
• The model suggests that learned associations, rather than solely energy depletion, drive the experience of hunger.

Conclusions:

• The proposed L&M model offers a more comprehensive understanding of human hunger, integrating cognitive and physiological aspects.
• This framework has implications for understanding thirst, the cephalic phase response, and motivational theories of hunger.
• Further research is needed to explore the intersection of L&M, physiology, and the subjective experience of hunger.