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Individual differences in the discounting of combination outcomes in which immediate gains are followed by delayed losses
Ano: 2024
Abstract The vast majority of studies on discounting have focused on simple delayed outcomes, but most everyday decisions are more complicated. The present experiment focused on one such scenario, an iconic self‐control situation in which immediate gains are followed by delayed losses. The same participants were studied in all conditions to permit examination of individual differences in choice behavior using intercorrelations and factor analysis. Consistent with previous research, the hyperboloid model accurately described the form of the discounting function and discounting was not affected by the amount of the delayed loss when it was presented alone. However, replicating other studies, smaller delayed losses were discounted more steeply than larger ones when presented in combination with immediate gains. Exploratory factor analysis revealed two factors, one loading primarily on loss‐only conditions and the other loading primarily on conditions involving outcomes that combined gains and losses. These results imply that there are individual differences in how one combines gains and losses and that this characteristic of individual decision making might be an important predictor of decisions in the many everyday choice situations that involve complex outcomes.
Inducing select/reject control in a matching‐to‐sample procedure with observing response: Effects on stimulus equivalence
Ano: 2024
Abstract This study investigated a three‐choice matching‐to‐sample procedure with an observing‐response requirement to induce select and reject control during baseline training and examined their effects on the formation of equivalence classes. The study involved four girls, aged 8 to 10 years, who participated in a computer‐based task that alternated between conditions designed to induce select and reject control by requiring observing responses to display the stimuli. In the select‐control condition, the correct stimulus was revealed first on at least 75% of the trials, increasing the likelihood of selecting the correct stimulus without seeing the incorrect ones. In contrast, in the reject‐control condition, the correct stimulus was revealed third on at least 75% of the trials, forcing the display of both incorrect stimuli. This procedure successfully generated both select and reject control, which increased progressively with the accuracy during baseline training trials. Select control was more prominent than reject control, but both led to the formation of equivalence classes. This finding suggests that reject control does not hinder control by the correct stimulus.
Influence of amount and delay of reward on choice and response rate: A free‐operant, multiple‐schedule analogue of a discrete‐trial procedure
Ano: 2024
Abstract The current study explored a free‐operant analogue of discrete‐trial procedures to study the effects of amount and delay of reinforcement on choice and response rate. Rats responded on a multiple variable‐interval (VI) 45‐s, 45‐s schedule, with interspersed choice probe trials. Comparison of relative response rates and percentage of choice revealed some discrepancies between the free‐operant analogue and discrete‐trial procedures. Amount of reward controlled choice behavior when the ratios of delays were similar. When reward delays were more discrepant, delay length controlled choice behavior. Whereas the percentage of choice was larger for the larger magnitude reward, the relative rate of response for the larger magnitude was less than .50. In contrast, when the percentage of choice generally fell to below 50% (with large amount and large delay differences between alternatives), relative response rate indicated a preference for the larger amount alternative. This study shows the feasibility and utility of a free‐operant analogue of discrete‐choice studies that could be used to develop an analysis of preference.
Influence of reinforcement and its omission on trial‐by‐trial changes of response bias in perceptual decision making
Ano: 2024
Abstract Discrimination performance in perceptual choice tasks is known to reflect both sensory discriminability and nonsensory response bias. In the framework of signal detection theory, these aspects of discrimination performance are quantified through separate measures, sensitivity ( d′ ) for sensory discriminability and decision criterion ( c ) for response bias. However, it is unknown how response bias (i.e., criterion) changes at the single‐trial level as a consequence of reinforcement history. We subjected rats to a two‐stimulus two‐response conditional discrimination task with auditory stimuli and induced response bias through unequal reinforcement probabilities for the two responses. We compared three signal‐detection‐theory‐based criterion learning models with respect to their ability to fit experimentally observed fluctuations of response bias on a trial‐by‐trial level. These models shift the criterion by a fixed step (1) after each reinforced response or (2) after each nonreinforced response or (3) after both. We find that all three models fail to capture essential aspects of the data. Prompted by the observation that steady‐state criterion values conformed well to a behavioral model of signal detection based on the generalized matching law, we constructed a trial‐based version of this model and find that it provides a superior account of response bias fluctuations under changing reinforcement contingencies.
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Ano: 2024
Issue Information
Ano: 2024
Issue Information
Ano: 2024