In the present study, we employed an automated go/go active choice lever-press task using two reward outcomes – one vs. two 45 mg food pellets.
The subjects were presented with a series of trials consisting of a 2-s presentation of a reference auditory tone (either 2 kHz or 4 kHz), followed by the presentation of both (free-choice) or one (forced-choice) lever(s).
Mice had the choice between lever pressing for a more preferred food (FR35, every 35 lever presses delivers a 20 mg sucrose pellet) or consuming a less preferred standard rodent chow that was concurrently and freely available on the floor of the operant box.
A variety of policy levers can be applied by governments to deliver health service reform; with the choice of lever being influenced by the political climate, as well as constitutional and legal restrictions on government authority [ 23].
Figures 3b shows the amount of time animals spent nosepoking during the choice phase (lever presentation).
For each rat, the percentage choice of lever B in the free-choice trials (% B) was computed for each block of trials from the pooled data from the last 10 sessions of each phase of the experiment.
If the Pentagon's elite forces become the covert instrument of choice, the levers of control have to be extended, he added, no matter how tough the defense secretary.
Thus, each day, rats were under the influence of cocaine (i.e., cocaine-intoxicated) before making their 8 choices between lever S and lever C (S+/C+ condition).
The number of trials and the duration of the session were the same as in the adjusting-delay and adjusting-magnitude schedules; however, the no-delay schedule did not entail choice between levers nor was there any variation of delay or magnitude of reinforcement.
By default, the trials were free-choice (both levers available), and each auditory tone (2 kHz or 4 kHz) had an equal probability of presentation.
"One way of thinking about the grant is that it's a tacit admission that school choice as the lever for fundamentally changing education is politically fraught and they're instead choosing to diversify their portfolio".
