Learned helplessness or learned inactivity after inescapable stress? Interpretation depends on coping styles.
Researches on uncontrollable events in the post-soviet states are overviewed. In our research, susceptibility to learned helplessness is studied in rats with active (KHA strain) versus passive (KLA strain) coping styles. Inescapable footshocks, but not escapable footshocks, applied to KHA rats induced escape failures, diminished locomotion and coping, reduced measures of anxiety, and resulted in dexamethasone nonsuppression of the brain-hypothalamus-pituitary-adrenal axis--all characteristic of learned helplessness. In contrast, KLA rats demonstrated the same responses upon exposure to both escapable and inescapable stresses. While learned helplessness occurred in KHA rats, it appears that KLA rats exposed to inescapable stress demonstrated learned inactivity based upon the nondifference between effects of escapable and inescapable shocks. Relationships between coping styles and social ranks are discussed. Our and other's results with genetically selected strains suggest active coping in dominant and subordinate subjects, and passive coping in subdominant animals confirm the importance of coping style and its relation to health under stress.
Zhukov
D A
DA
Pavlov Institute of Physiology, St Petersburg, Russia. dazh@infran.ru
Vinogradova
K P
KP
D000223:Adaptation, Psychological; D000818:Animals; D004597:Electroshock; D005838:Genotype; D006380:Helplessness, Learned; D010641:Phenotype; D051381:Rats; D011919:Rats, Inbred Strains / Q000235:genetics; D013315:Stress, Psychological / Q000235:genetics*