These are excerpts and elaborations from my book "The Nature of Consciousness"
Emotion as Change Of Body
State The lessons of William James and Antonio Damasio provided a new framework for
the study of emotions. The US philosopher Jesse
Prinz and the US psychologist James Laird even equated emotions to higher
cognitive faculties such as vision or touch, which represent the relation
between the subject and the environment. There is evidence that
specific circuits in the brain are devoted to handling emotions. These regions
communicate the "emotion" to the rest of the body via the bloodstream
and the nervous system. The effect is to cause a change in the state of the
body. So the emotion is really an "amplifier" of a signal that came
from either the body itself or from the external world (itself mediated by the
senses, which are part of the body). Ultimately, the emotion looks like a loop:
a change of state in the body causes an emotion that causes a change of state
in the body. The state change caused by
the emotion is, somehow, a direct response to the state change that caused the
emotion. The emotion is trying to maintain the "status quo" in the
face of destabilizing news. The emotion is a mechanism to regulate the body,
and the regulation is "homeostatic" in nature, i.e. it aims at
maintaining a stable state. That "stable"
state has to do, ultimately, with survival of the organism. All emotions can be
reduced to the basic emotions of "pain" and "pleasure", of
negative and positive reward. Both pain and pleasure guide the organism towards
the actions that maximize its chances of survival. The brain is endowed with
another mechanism for survival, the one that we call "cognition". The
brain analyzes the world and makes decisions about it. Emotion and cognition
work towards the same goal on parallel tracks. The advantage of emotion over
cognition is that it provides a short-cut: instead of analyzing every single
stimulus separately, it allows the organism to react to different stimuli with
the same action. Fear is the reaction to any kind of danger, even if they are
completely different events. Emotion enables similar response to different
stimuli, without any need to "think" about it. The disadvantage of emotion
is that sometimes the short-cut is not perfect: it may lead us to
"over-react". Where does this "short-cut"
mechanism come from? If its purpose is survival of the organism, it was
probably selected by evolution. Emotion encodes a logic of survival that was
developed over the course of the evolution of species. The US psychologist Peter
Lang (“The Cognitive
Psychophysiology Of Emotion”, 1985) believes that it all started with simple
emotions related to brain circuits; that two separate "motivational"
systems coexist in the brain, one ("appetitive" system) leading us
towards stimuli that cause pleasure, and one ("defensive" system)
steering us away from stimuli that cause pain. As the brain's circuitry grew
larger and more complex, these elementary emotions of pleasure and pain, that
corresponded to motivations for approach and avoidance, evolved into the varied
repertory of emotions of today's humans. It
is a fact that, evolutionarily speaking, the brain components that preside over
emotions are older. First brains started feeling emotions, then they started
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