Reward magnitude and instrumental responses: Consistent and partial reward

Instrumental vigour in punishment and reward.

Recent notions about the vigour of responding in operant conditioning suggest that the long-run average rate of reward should control the alacrity of action in cases in which the actual cost of speed is balanced against the opportunity cost of sloth. The average reward rate is suggested as being reported by tonic activity in the dopamine system and thereby influencing all actions, including one...

Orbital prefrontal cortex and guidance of instrumental behavior of rats by visuospatial stimuli predicting reward magnitude.

The orbital prefrontal cortex (OPFC) is part of a circuitry mediating the perception of reward and the initiation of adaptive behavioral responses. We investigated whether the OPFC is involved in guidance of the speed of instrumental behavior by visuospatial stimuli predictive of different reward magnitudes. Unoperated rats, sham-lesioned rats, and rats with bilateral lesions of the OPFC by N-m...

Asymptotic Behavior of Multivariate Reward Processes with Nonlinear Reward Functions

COVARIANCE MATRIX OF MULTIVARIATE REWARD PROCESSES WITH NONLINEAR REWARD FUNCTIONS

Multivariate reward processes with reward functions of constant rates, defined on a semi-Markov process, first were studied by Masuda and Sumita, 1991. Reward processes with nonlinear reward functions were introduced in Soltani, 1996. In this work we study a multivariate process , , where are reward processes with nonlinear reward functions respectively. The Laplace transform of the covar...

Delayed Reward Discounting and Alcohol Misuse: The Roles of Response Consistency and Reward Magnitude.

Delayed reward discounting (DRD) is a common index of impulsivity that refers to an individual's devaluation of rewards based on delay of receipt and has been linked to alcohol misuse and other maladaptive behaviors. The current study investigated response consistency and reward magnitude effects in two measures of DRD in a sample of 111 undergraduates who consumed an average of 10.7 drinks/wee...