Resistance to stimulus control of conditioned aggression in pigeons

Previous investigators have brought aggressive behavior in rats and Carneaux pigeons under the control of exteroceptive stimuli. In an unpublished study I failed to bring such behavior under stimulus control using Medina pigeons. Using six Modinas and six Carneauxs the present study assessed the effects of procedure and strain of pigeon on resistance to stimulus control. The question of procedure was not satisfactorily answered. Medina pigeons appeared to be somewhat more aggressive than Carneauxs. The results are discussed in terms of extinction produced aggression in S[raised Delta] and "carry over" responding from reinforced aggression in S[raised D].