A developmental examination of gender differences in brain engagement during evaluation of threat.
BACKGROUND
Females appear to be more sensitive and responsive to social cues, including threat signals, than are males. Recent theoretical models suggest that developmental changes in brain functioning play important roles in the emergence of such gender differences.


METHODS
We used functional magnetic resonance imaging to examine developmental and gender differences in activation of neural structures thought to mediate attention to emotional faces depicting varying degrees of threat. Analyses focused on the orbitofrontal cortex, amygdala, and anterior cingulate cortex during the evaluation of threat conveyed by faces. Healthy adolescents (n = 17; 53% male) and adults (n = 17; 53% male) were scanned while they rated how threatening pictures of neutral and emotional (angry, fearful, or happy) faces appeared.


RESULTS
Results indicate significant interactions among age, gender, and face type for activation during explicit threat monitoring. In particular, adult women activated orbitofrontal cortex and amygdala selectively to unambiguous threat (angry) cues, while adult men showed a less discriminating pattern of activation. No gender differences were evident for adolescents, who as a group resembled adult males.


CONCLUSIONS
These findings suggest that there are gender differences in patterns of neural responses to emotional faces that are not fully apparent until adulthood.
McClure
Erin B
EB
Section on Development and Affective Neuroscience, National Institute of Mental Health, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892, USA.
Monk
Christopher S
CS
Nelson
Eric E
EE
Zarahn
Eric
E
Leibenluft
Ellen
E
Bilder
Robert M
RM
Charney
Dennis S
DS
Ernst
Monique
M
Pine
Daniel S
DS
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001921:Brain / Q000033:anatomy & histology / Q000502:physiology*; D001931:Brain Mapping; D002648:Child; D004630:Emergencies / Q000523:psychology*; D004644:Emotions / Q000502:physiology*; D005069:Evaluation Studies as Topic; D005149:Facial Expression; D005260:Female; D007839:Functional Laterality; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D010775:Photic Stimulation / Q000379:methods; D012727:Sex Characteristics; D012737:Sex Factors