Varying reinforcement magnitude on interval schedules

In Experiment 1, rats were trained on either a random-interval or a variable-interval 60-sec schedule of reinforcement, and reinforcement magnitude was varied across conditions between one and four pellets. Although the two schedules maintained different patterns of behaviour, patterns and rates of responding were not systematically affected by the variation in reinforcement magnitude. In Experiment 2, a regulated probability interval schedule that generated similar rates of reinforcement to those of the schedules of Experiment 1 was used, with the pattern of behaviour generated resembling that typical of a random-interval schedule. Changing reinforcement magnitude again produced few systematic changes in behaviour. In Experiment 3, a variable-ratio schedule was used within a procedure that otherwise resembled that of Experiments 1 and 2. Increasing the reinforcement magnitude now decreased the rates of responding, and examination of the patterns of responding showed that this came about because rates of responding were higher early in the interreinforcer interval in the one-pellet condition. These experiments demonstrate the insensitivity of behaviour under interval schedules to changes in reinforcement magnitude and suggest the operation of mechanisms different from those engaged by ratio schedules and discretetrial learning procedures.     

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Allatum est die 8 Octobris 1968     

On the Logic of Acceptance and Rejection

The logic of acceptance and rejection (AEL2) is a nonmonotonic formalism to represent states of knowledge of an introspective agent making decisions about available information. Though having much in common, AEL2 differs from Moore's autoepistemic logic (AEL) by the fact that the agent not only can accept or reject a given fact, but he/she also has the possibility not to make any decision in case he/she does not have enough knowledge.     

Perceptions of Sexual Harassment as a Function of Target's Response Type and Observer's Sex

Although research has investigated definitionsand prevalence of sexual harassment, little is knownabout responses to sexual harassment. Therefore, thepresent study was designed to explore how individuals interpret the communication of various targetresponses. One hundred and twenty employees fromhealthcare settings were randomly assigned to one offour conditions. The majority of the individuals in the sample was White-European American (75%) whilethe remaining 25% was comprised of minority members. Theconditions contained a video-taped interaction betweentwo co-workers, one male and one female. The male's behavior in each interaction continuedto escalate to the point of sexual harassment while thefemale's responses varied. There were two passiveresponses and two assertive responses. After viewing the short video participants responded toquestions assessing their perceptions of theinteraction. Results indicated there were no differencesin perceptions between men and women when viewing thevarious conditions. There were, however, differencesfound between the assertive conditions and the passiveconditions. Specifically, assertive responses areperceived as more effective than passive responses in communicating unwelcomeness and in deterringthe initiator's persistence. However, consistent withthe research on responses to sexual harassment,perceptions of sexual harassment appear to be based more on the initiator's behavior than on thetarget's responses.