1This research was conducted at Florida State University and was supported, in part, by Psychology Research Grants (United States Public Health Service Grants NB-7468 and MH-11218 and National Science Foundation Grant GU-2612). Was supported by National Science Foundation Traineeship Grant #G7-1975. Portions of this paper were presented at the Southeastern Psychological Association Meetings (1972 and 1973) and at the Eastern Psychological Association Meeting, Washington, D.C., 1973. Reprints may be obtained from either author, Department of Psychology, Northeastern University, Boston, Massachusetts 02115. AbstractThree pigeons with a history of attacking a mirror target, and two of six pigeons with no prior exposure to targets, attacked a colored photograph of a conspecific during exposure to intermittent schedules of reinforcement for key pecking. Rate of attack on the photograph decreased when the reinforcement schedule was removed.

The topography, temporal pattern, and locus of attack on the picture were comparable to schedule-induced attack on live, stuffed, and mirror targets. When silhouette, outline, and plain paper targets were used, schedule-induced attack was more sensitive to a change in target characteristics with a concurrent target-preference procedure than with an analogous successive-testing procedure. The combined results of the two testing procedures indicated that an “upright” white-on-black silhouette of a pigeon with or without an eye was more effective in controlling attack than was a comparable “inverted” silhouette, an outline of a pigeon, or a piece of colored paper. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the (1.6M), or click on a page image below to browse page by page.

Links to PubMed are also available for. Azrin NH, Hutchinson RR, Hake DF.

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Gunjack is an action-packed arcade shooter built from the ground up for virtual reality. Immerse yourself in a visually stunning sci-fi world of danger and destruction, available for the Playstation VR, Oculus Rift, Samsung Gear VR and HTC Vive headsets. Gun jack tekken 7.

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Why did the birds attack in the movie the birds? Wiki User 2013-10-07 16:21:42. Supermagical chest arena 4. Please don't think me a 'movie snob', but the bird attacks are. Really not the point of the movie.