Frontal asymmetry in positive and negative emotion.pdf

NeuroImage

13, Number

6, 2001,

Part 2 of 2 Parts

1 D E al@

EMOTION

COGNITION

Frontal asymmetry in positive and negative emotion:

Evidence from functional neuroimaging

Andrew Lawrence*t& Fionnuala Murphy*t$$’

h4RC Cognition and Brain Sciences Unit,15 Chaucer Road, Cambridge, UK, CB2 2EF

The

role

of hemispheric

asymmetry

in emotion

has long

been

a topic

of controversy.

While

early

theories

highlighted

the

importance

of right

hemisphere

function

in emotional

processes,

recent

human

lesion

and electrophysiological

studies

point

towards

differential

involvement

of left

and right

frontal

cortical

regions

in the experience

of positive

and negative

emotion,

respectively.

The recent

application

of functional

neuroimaging

to the study

of emotion

offers

new data that may be useful

in testing

this

latter

hypothesis,

but

conclusions

drawn

from

individual

studies

are often

compromised

limited

statistical

power

and

suboptimal

control

conditions.

In the present

study,

we combined

data from

over

20 studies

of positive

(happiness,

pleasantness)

and

negative

(sadness,

anger,

fear,

guilt,

disgust,

anxiety,

unpleasantness)

emotions

induced

using

varied

mood

induction

techniques

(retrieval

of emotional

memories,

film

clips,

affective

pictures);

all included

a neutral

emotion

condition

and mood

manipulation

check.

Peak

frontal

maxima

points

from

these

studies

were

superimposed

onto

the standard

Statistical

Parametric

Mapping

brain

surface.

The pooled

results

for positive

emotions

showed

consistent

activation

of medial

and dorso-medial

frontal

cortical

regions,

particularly

in the left hemisphere;

for negative

emotions,

bilateral

activation

of ventral,

ventro-lateral,

and medial

prefrontal

cortex

was observed.

While

offering

some

support,

these

findings

are not entirely

consistent

with

work

hemispheric

differences

in emotion.

Methodological

and theoretical

explanations

for these

differences

are considered.

S438

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