In this article it is argued that positive self-instruction can be an
important aid for the treatment of emotional disorders. A review of th
e literature revealed that studies on the effects of positive self-ins
truction are often unclear and generally hampered by contamination bet
ween different treatment techniques. The present study tests the effec
ts of positive self-instruction in isolation. A pre-post controlled tr
ial with participants characterized by low self-esteem was carried out
. In the experimental condition 24 participants were instructed to wri
te a short positive text about themselves and to read this text twice
daily for a period of 3 weeks. In the control condition 26 participant
s carried out a neutral task which consisted of writing the endings of
a few short stories. Positive self-instruction had positive effects o
n self-esteem and on feelings of inadequacy, especially in those parti
cipants who were intrinsically motivated to carry out the experimental
task. The intervention had no significant effects on a number of pers
onality trait measures, which negates demand characteristics as an alt
ernative explanation for our findings. Implications for clinical pract
ice and research are considered.