Carroll E. Izard reviews the current state of emotion theory and research, highlighting key principles and unresolved issues. Emotion feeling is a phase of neurobiological activity, central to emotions and consciousness. Emotion schemas, dynamic interactions between emotion and cognition, can be momentary or enduring traits. Emotions are crucial for the evolution of consciousness and mental processes. Different types of emotions relate to different levels of consciousness. Unresolved issues include the neglect of non-access consciousness and the use of "unconscious mind" as a catch-all term. The relationship between memes, mirror neuron systems, and empathy, as well as cultural influences on socioemotional skills, remain unresolved. The article outlines seven principles of differential emotions theory (DET), emphasizing the role of emotions in consciousness evolution, their motivational and informational functions, and the interaction between emotion and cognition. Emotion schemas are dynamic, involving continuous interaction between neural systems and mental processes. Emotion utilization, dependent on effective emotion-cognition interactions, is adaptive thought or action. Maladaptive emotion schemas can lead to psychopathology. Interest, a fundamental emotion, is central to engagement and well-being. Emotion feeling is a phase of neurobiological activity, sensed by the organism. It is not a consequence but a phase of neurobiological activity. Emotion feelings are influenced by perceptual, appraisal, conceptual, and noncognitive processes. They are essential for adaptive responses and survival. Emotion feelings are critical for the evolution of consciousness and affective, cognitive, and action processes. Emotion feelings are not nonphysical and can be causal. They are felt and influence cognition and action. Emotion feelings are dynamic, involving continuous interaction between emotion and cognition. They are essential for motivation and information. Emotion feelings are the key psychological aspect of emotion, influencing behavior and cognition. Emotion feelings are the dynamic component of emotion, enabling entrainment of impulses and organization of behavior. Emotion feelings are essential for the development of self-concept and social skills. Emotion schemas are dynamic interactions between emotion and cognition, influencing mind and behavior. They are influenced by individual differences, learning, and cultural contexts. Emotion schemas can be stable traits or brief interactions. They are crucial for adaptive thought and action. Emotion schemas can become maladaptive and lead to psychopathology. The article discusses the distinction between basic emotions and emotion schemas, emphasizing the importance of understanding both. Basic emotions are fundamental to survival and evolution, while emotion schemas involve higher-order cognition. Emotion schemas are crucial for social and emotional development. The article also addresses the relationship between emotions and consciousness, highlighting the role of emotion feelings in generating conscious experiences. The article concludes with the importance of understanding the evolution of emotions and consciousness, noting both gains and losses. Emotions have enabled language and social interaction, but also led to empathy-sympathy exchanges and potential losses in empathy. The role of mirror neuron systems, memes, and cultural influences on socioemCarroll E. Izard reviews the current state of emotion theory and research, highlighting key principles and unresolved issues. Emotion feeling is a phase of neurobiological activity, central to emotions and consciousness. Emotion schemas, dynamic interactions between emotion and cognition, can be momentary or enduring traits. Emotions are crucial for the evolution of consciousness and mental processes. Different types of emotions relate to different levels of consciousness. Unresolved issues include the neglect of non-access consciousness and the use of "unconscious mind" as a catch-all term. The relationship between memes, mirror neuron systems, and empathy, as well as cultural influences on socioemotional skills, remain unresolved. The article outlines seven principles of differential emotions theory (DET), emphasizing the role of emotions in consciousness evolution, their motivational and informational functions, and the interaction between emotion and cognition. Emotion schemas are dynamic, involving continuous interaction between neural systems and mental processes. Emotion utilization, dependent on effective emotion-cognition interactions, is adaptive thought or action. Maladaptive emotion schemas can lead to psychopathology. Interest, a fundamental emotion, is central to engagement and well-being. Emotion feeling is a phase of neurobiological activity, sensed by the organism. It is not a consequence but a phase of neurobiological activity. Emotion feelings are influenced by perceptual, appraisal, conceptual, and noncognitive processes. They are essential for adaptive responses and survival. Emotion feelings are critical for the evolution of consciousness and affective, cognitive, and action processes. Emotion feelings are not nonphysical and can be causal. They are felt and influence cognition and action. Emotion feelings are dynamic, involving continuous interaction between emotion and cognition. They are essential for motivation and information. Emotion feelings are the key psychological aspect of emotion, influencing behavior and cognition. Emotion feelings are the dynamic component of emotion, enabling entrainment of impulses and organization of behavior. Emotion feelings are essential for the development of self-concept and social skills. Emotion schemas are dynamic interactions between emotion and cognition, influencing mind and behavior. They are influenced by individual differences, learning, and cultural contexts. Emotion schemas can be stable traits or brief interactions. They are crucial for adaptive thought and action. Emotion schemas can become maladaptive and lead to psychopathology. The article discusses the distinction between basic emotions and emotion schemas, emphasizing the importance of understanding both. Basic emotions are fundamental to survival and evolution, while emotion schemas involve higher-order cognition. Emotion schemas are crucial for social and emotional development. The article also addresses the relationship between emotions and consciousness, highlighting the role of emotion feelings in generating conscious experiences. The article concludes with the importance of understanding the evolution of emotions and consciousness, noting both gains and losses. Emotions have enabled language and social interaction, but also led to empathy-sympathy exchanges and potential losses in empathy. The role of mirror neuron systems, memes, and cultural influences on socioem