Morbid jealousy is a potentially disruptive condition that has receivedlittle attention. A cognitive-behavioural formulation of morbid jealousyproposes that such individuals possess schema in which there is a perceivedthreat of loss of their sexual partner. An attentional bias in morbidjealousy was investigated by using a dichotic listening task and themodified Stroop test. Twenty subjects who had met criterion for morbidjealousy were compared with 20 control subjects. In the dichotic listeningtask, word pairs were presented to each ear simultaneously, and subjectsshadowed one channel while identifying target words. Ten percent of thewords presented to the non-attended channel were target words, of whichhalf were jealousy-related and half were not. Subjects were not told thatthe target words were only presented in the unattended channel. In themodified Stroop test, subjects had to name the colour of a series of Os,colour words, emotional words, control neutral words and jealousy-relatedwords. As predicted, jealous subjects showed a superior performance indetecting jealousy-related stimuli in the dichotic listening task and animpaired performance in the colour naming of jealousy-related stimuli inthe modified Stroop test, compared to the control subjects and the controlconditions. The results of this study add support to the formulation thatmorbid jealousy involves an attentional bias towards jealousy-relatedinformation and this may have clinical implications.