REINFORCER ACCUMULATION IN A TOKEN-REINFORCEMENT CONTEXT WITH PIGEONS

Four pigeons were exposed to a token-reinforcement procedure with stimulus lights serving as tokens. Responses on one key (the token-production key) produced tokens that could be exchanged for food during an exchange period. Exchange periods could be produced by satisfying a ratio requirement on a second key (the exchange-production key). The exchange-production key was available any time after one token had been produced, permitting up to 12 tokens to accumulate prior to exchange. Token accumulation, measured in terms of both frequency (percent cycles with accumulation) and magnitude (mean number of tokens accumulated), decreased as the token-production ratio increased from 1 to 10 across conditions (with exchange-production ratio held constant), and increased as the exchange-production ratio increased from 1 to 250 across conditions (with token-production ratio held constant). When tokens were removed, accumulation decreased markedly compared to conditions with tokens and the same schedules. These data show that token accumulation is an orderly function of token-production and exchange-production schedules, and they are broadly consistent with a unit-price model based on local and global responses per reinforcer.     

Token reinforcement: Translational research and application

The present paper provides an integrative review of research on token reinforcement systems, organized in relation to basic behavioral functions and economic variables. This type of functional taxonomy provides a useful way to organize the literature, bringing order to a wide range of findings across species and settings, and revealing gaps in the research and areas especially ripe for analysis and application. Unlike standard translational research, based on a unidirectional model in which the analysis moves from laboratory to the applied realm, work in the area of token systems is best served by a bidirectional interplay between laboratory and applied research, where applied questions inspire research on basic mechanisms. When based on and contributing to an analysis, applied research on token economies can be on the leading edge of theoretical advances, helping set the scientific research agenda.     

Das Asperger-Syndrom bei Erwachsenen

Herr F., 35 Jahre alt, wendet sich per E-Mail an die Kinderklinik mit der Frage, ob eine diagnostische Abkl?rung bei uns m?glich sei, da er im Erwachsenenbereich keine Ansprechperson gefunden habe. Durch eine Internetrecherche sei er auf das Asperger-Syndrom gesto?en. Seit seiner Kindheit habe er sich bereits gefragt, was bei ihm nicht stimme, warum er ,,anders“ sei und warum es seinen Mitschülern immer so leicht gefallen sei auf andere zuzugehen, ,,Small Talk“ zu führen oder Kontakte aufrecht zu erhalten. Er hingegen habe damit immer massive Schwierigkeiten gehabt, habe soziale Zusammenh?nge oft nicht begriffen beziehungsweise die Gedanken, Absichten oder Gefühle anderer nicht entschlüsseln k?nnen. Obwohl er dies erkennt, konnte er es bisher nicht bewusst ?ndern, was in weiterer Folge zu einer depressiven Verstimmung mit Rückzug geführt hat. In der weiteren Exploration stellt sich heraus, dass Herr F. alleine wohnt, aber immer noch finanziell beziehungsweise im Alltag von seinen Eltern unterstützt wird. Derzeit hat er keine Beziehung, die vorangegangene Partnerschaft ging wegen Kommunikationsproblemen in die Brüche, worunter er sehr leidet. Aufgrund seiner speziellen Interessen studierte Herr F. Astrophysik und technische Mathematik und schloss beide Studien mit Auszeichnung ab. Seither hat er in etwa 20 verschiedenen Jobs gearbeitet, die meist nicht seiner Qualifikation entsprachen. Das Arbeitsverh?ltnis wurde jeweils beendet, da Herr F. von den sozialen Anforderungen massiv überfordert war. Seine Freizeit verbringt Herr F. alleine, bet?tigt sich im Internet in Chatrooms, liest Fachliteratur und hat eine vollst?ndige Sammlung an Sportfachzeitschriften seit dem Jahr 1995, die er in einer bestimmten Ordnung aufbewahrt und deren Inhalte er so gut wie auswendig kennt.     

Remote effects of aversive contingencies: Disruption of appetitive behavior by adjacent avoidance sessions

Disruption of ongoing appetitive behavior before and after daily avoidance sessions was examined. After baselines of appetitive responding were established under a fixed-interval 180-s schedule of food presentation, 4 rats were exposed to 40-min sessions of the appetitive schedule just prior to 100-min sessions of electric shock postponement, while another 4 rats received the 40-min appetitive sessions just following daily sessions of shock postponement. In all 8 subjects, fixed-interval response rates decreased relative to baseline levels, the effect being somewhat more pronounced when the avoidance sessions immediately followed. The disruption of fixed-interval responding was only partially reversed when avoidance sessions were discontinued. During the initial exposure to the avoidance sessions, patterns of responding under the fixed-interval schedule were differentially sensitive to disruption, with high baseline response rates generally more disturbed than low rates. These disruptions were not systematically related to changes in reinforcement frequency, which remained fairly high and invariant across all conditions of the experiment; they were also not systematically related to the response rates or to the shock rates of the adjacent avoidance sessions. The results, while qualitatively resembling patterns of conditioned suppression as typically studied, occurred on a greatly expanded time scale. As disruption of behavior extending over time, the present data suggest that some forms of conditioned suppression are perhaps best viewed within a larger temporal context.     

Reinforcement contingencies and social reinforcement: some reciprocal relations between basic and applied research.

Reinforcement contingencies and social reinforcement are ubiquitous phenomena in applied behavior analysis. This discussion paper is divided into two sections. In the first section, reinforcement contingencies are discussed in terms of the necessary and sufficient conditions for reinforcement effects. Response‐stimulus dependencies, conditional probabilities, and contiguity are discussed as possible mechanisms of, and arrangements for, reinforcement effects. In the second section, social reinforcement is discussed in terms of its functional subtypes and reinforcement context effects. Two underlying themes run throughout the discussion: (a) Applied research would benefit from a greater understanding of existing basic research, and (b) basic research could be designed to specifically address some of the issues about reinforcement that are central to effective application.     

Second-order schedules of token reinforcement with pigeons: implications for unit price

Four pigeons were exposed to second-order schedules of token reinforcement, with stimulus lights serving as token reinforcers. Tokens were earned according to a fixed-ratio (token-production) schedule, with the opportunity to exchange tokens for food (exchange period) occurring after a fixed number had been produced (exchange-production ratio). The token-production and exchange-production ratios were manipulated systematically across conditions. Response rates varied inversely with the token-production ratio at each exchange-production ratio. Response rates also varied inversely with the exchange-production ratio at each token-production ratio, particularly at the higher token-production ratios. At higher token-production and exchange-production ratios, response rates increased in token-production segments closer to exchange periods and food. Some conditions were conducted in a closed economy, in which the pigeons earned all their daily ration of food within the session. Relative to comparable open-economy conditions, response rates in the closed economy were less affected by changes in token-production ratio, resulting in higher levels of food intake and body weight. Some of the results are consistent with the economic concept of unit price, a cost-benefit ratio comprised of responses per unit of food delivery, but most are well accounted for by a consideration of the number of responses required to produce exchange periods, without regard to the amount of reinforcement available during those exchange periods.