Frontal
EEG Asymmetry, Affective Style and Psychopathology
Affective disorders such as depression
and anxiety are a pervasive and costly source of emotional suffering.
In a variety of projects, we are working toward characterizing the
role of asymmetrical patterns of electroencephalographic (EEG) activity
over the frontal cortex in affective style, emotion regulation and
risk for affective disorders. A large and growing body of research
now associates relatively greater left prefrontal neural activity
with approach oriented affects such as anger and joy, and relatively
greater right prefrontal neural activity with withdrawal oriented
affects such as fear, sadness and disgust. These affective associations
have implications for the development of affective disorders. For
example, numerous studies have associated depression and anxiety
with a generalized pattern of relatively more right than left resting
prefrontal brain activity. More recently, relatively greater left
prefrontal activity has been associated with hypomanic symptoms.
Much of this work is reviewed in Coan and Allen, 2004.
Our laboratory is involved in a number
of studies related to these general observations. The following
work highlights examples of the kinds of work the VAN lab does in
this area.
•We
are attempting to determine whether prefrontal EEG asymmetries
function as 1) episode markers that simply characterize the
presence or absence of affective disorders, 2) liability markers
that characterize persons with affective disorders as well as
healthy persons at risk for affective disorders, or 3) genetic
markers that characterize persons with a genetic risk for affective
disorders.
•We
are interested in characterizing the interaction between frontal
EEG asymmetries and environmental stress. Examples of this
include...
•...understanding
how prefrontal EEG asymmetries interact with social processes
in determining emotional and academic adjustment to the first
year of college.
•...identifying
the role of prefrontal asymmetries in the development of learned
helplessness. For example, when faced
with uncontrollable and repeated failures to achieve goals,
individuals can begin to lose motivation for other activities,
begin to feel hopeless and experience an increased likelihood
of making mistakes when coping with problems that are in fact
controllable. We are investigating the ways in which patterns
of EEG activity over the frontal cortex both track and interact
with this process.
•...learning
how prefrontal EEG asymmetries interact with ordinary daily
events to produce affective responses.
•...attempting
to ascertain the degree to which neural processes indexed by
prefrontal EEG asymmetries actually mediate relationships between
environmental stress and affective responses.
•We
are increasingly interested in fundamental questions of prefrontal
EEG asymmetry and Affective Style--the ways with which individuals
typically respond to various classes of affective stimuli.
For this work, we are measuring EEG and various personality
inventories. Most recently, we have begun measuring frontal
EEG asymmetry and affective temperament in infants.
•We have long worked toward solving long standing methodological issues in the measurement of frontal EEG asymmetry, such as the determination of optimal reference schemes, the measurement of prefrontal asymmetries in real-time emotional responding, and the determination of optimal measurement conditions for affectively meaningful EEG (e.g., the degree to which such asymmetries best measured under traditional "resting" conditions as opposed to experimentally induced emotional challenges that elicit emotion regulation capabilities.)
Research
Public
Art/Science Collaborations
•Eye
& I. With London designer Helen
Storey, I have collaborated on a conceptual art exhibit
that expresses many of my scientific interests and findings
in a creative and accessible way that is available to the general
public. The first installation of this exhibit occurred in May
of 2005, and new installations are in the planning stages. This
work has been assisted by the Royal
Court Theatre and generously funded by the Arts
Council of England, and Creative
Partnerships. For more information, see
•"Eye
& I" on Front Row with John Wilson (9.2 MB)
•http://www.helenstoreyfoundation.org/pro5.htm
•http://www.creative-partnerships.com/news/91033?view=Standard
•Discrete
Terrain: Windows on Five Emotions. Digital animation artist
Eva Lee has used EEG asymmetry data from the VAN lab to generate
alternative landscapes of emotional responding both across and
within individuals. “This work invites you to view the inner
world of twelve individuals who participated in a study on the
brain basis of emotions. Using data from EEG readings of the
twelve subjects during five emotional states (anger, joy, fear,
sadness, and disgust), artist Eva Lee and composer Manly Romero
have created a visual and auditory journey through the discrete
terrain of subjective experience." --Wadsworth Atheneum
Museum of Art
VIRGINIA
AFFECTIVE NEUROSCIENCE LABORATORY
University of Virginia • Department of Psychology • 314 Gilmer Hall
• PO BOX 400400
Charlottesville, VA 22904-4400 • tel: 434.243.2323 • fax: 434.982.4766
Ongoing Research
Facial
Movement and Emotional Experience
Our emotional expressions affect our own feelings and behaviors at least as much as those around us. Researchers have long known that simply expressing an emotion, especially on the face, is sufficient for causing emotional experiences, or priming our responses to emotional stimuli. The reason for this effect is still unknown and hotly debated. As part of our ongoing interest in the social functions of emotion, our laboratory is working to understand how our own emotional behavior alters our experience. For this work, we have used measures of subjective responses to physical pain, EEG measures of brain activity over the prefrontal cortex, and, most recently, fMRI measures of neural activity during emotional expression on the face.
The
Social Regulation of Emotion
The VAN Lab is actively investigating the mechanisms through which close social relationships and broader social networks regulate a given individual’s emotional responses. Utilizing functional neuroimaging, EEG and even measures of blood glucose concentration, we are developing a perspective on the regulation of emotion called Social Baseline Theory (SBT; Coan, 2008, 2010). SBT proposes that many mammalian and bird species are hard-wired to assume close proximity to conspecifics—and to utilize social proximity and interaction as a default or baseline affect regulation strategy. If true, then violations of the assumption of proximity should be (and indeed are) unconditionally threatening. By contrast, proximity to and positive interaction with conspecifics should be implicitly regulating by decreasing perceived personal costs associated with potentially dangerous situations and environments. Of course, non-human animals are incapable of regulating themselves by thinking things like “it’s only a movie” because they do not have sufficiently powerful prefrontal cortices. By comparison, humans have very powerful prefrontal cortices, and commensurably powerful self-regulation capabilities. Even humans, however, cannot self-regulate for long periods of time without diminishing their self-regulation capabilities significantly. This decline in self-regulatory capabilities follows the depletion of metabolic resources in the PFC, a cost that impairs other important prefrontally mediated operations (e.g., analytical problem solving, working memory) as well. The biological principle economy of action suggests that organisms will conserve resources whenever they can, and that indeed they must continuously optimize the ratio of resources acquired to resources expended or they will not survive. According to SBT, the prefrontal cortex represents a valuable and costly resource whose energy expenditures must be similarly managed, and socially mediated affect regulation is a powerful and efficient way to meet this need. SBT suggests social brains throughout the animal kingdom outsource, at lower cost, affect regulation (and problem solving, and memory) to their social networks. This explains why individuals tend to invest less effort in regulating negative affect in the presence of their attachment figure (Coan, Schaefer, et al., 2006). It is easy to see why this works. In a threatening situation, there may be four problems to solve. If you are alone, you must solve all four problems, which may involve a great deal of costly neural processing (and which, inefficiently distributed within your brain alone, might increase the probability of mistakes). If you are with a stranger, you know that at least one problem is taken care of (you no longer need to outrun the bear, for example, just the stranger). If you are with a trusted and interdependent partner, however, you may need to solve only two problems, or one (or, if you have an avoidant attachment style, five—making close relationships costly).