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W N SCHOENFELD

Publications and source records attributed to W N SCHOENFELD.

17 recordsLinked to original sources
PubMed1965

SEQUENTIAL RESPONSE EFFECTS IN THE WHITE RAT DURING CONDITIONING AND EXTINCTION ON A DRL SCHEDULE.

Sequential IRT data were obtained for three rats on a DRL 60-sec reinforcement schedule. It was found that first-order sequential dependencies exist under this schedule, including the partial dependence of the length of any given IRT on the length of the preceding IRT. The sequential analysis also served to extend the finding in the literature, based on frequency distributions, that the likelihood of a reinforced IRT is greater after a reinforced IRT than a non-reinforced IRT. Rapid extinction and reconditioning were obtained.

Extinction, Psychological↗
PubMed1964

INTER-REINFORCEMENT TIMES FOR THE BAR-PRESSING RESPONSE OF WHITE RATS ON TWO DRL SCHEDULES.

A knowledge of inter-reinforcement times (IS(R)T) seems of interest because, among other reasons, they bear on the variable of "reinforcement density" in behavior theory. IS(R)T data were here recorded for bar-pressing responses by two white rats working on DRL 10 sec and DRL 40 sec. Sample inter-response time (IRT) distributions and cumulative records were taken simultaneously for comparison purposes. IS(R)T sequences and distributions have certain characteristics that urge further investigation.

Rats↗
PubMed1964

BEHAVIOR STABILITY AND RESPONSE RATE AS FUNCTIONS OF REINFORCEMENT PROBABILITY ON "RANDOM RATIO" SCHEDULES.

A random ratio schedule is one under which every ordinally specified response has the same probability of reinforcement as any other. Data have been gathered at several values of this type of schedule, using a separate group of pigeons for each schedule value and giving prolonged exposure to each value. No simple relationship was found between response rate and reinforcement probability. In general aspect group data from the present experiment agree with those from a single organism study cited. It was shown that 40 to 50 days of exposure to random ratio schedules yields fairly asymptotic response rate data. The tabulated raw data, and the results of some statistical manipulations, have been deposited with the American Documentation Institute.

Animals↗
PubMed1964

EFFECTS OF A DRL CONTINGENCY ADDED TO A FIXED-INTERVAL REINFORCEMENT SCHEDULE.

Following 30 days of reinforcement for the bar press response of two white rats on 30-sec fixed-interval (FI), a DRL component was added so that a minimal interresponse time (IRT) for the reinforced response, in addition to the FI variable, was necessary for reinforcement. Marked control over response rate by the superimposed DRL requirement was demonstrated by an inverse hyperbolic function as the DRL component was increased from 1 to 24 sec within the constant 30-sec FI interval. Interresponse time and post-reinforcement (post-S(R)) "break" distributions taken at one experimental point (DRL = 24 sec) suggested that a more precise temporal discrimination was initiated by an S(R) than by a response, since the relative frequency of a sequence of two reinforced responses appeared greater than that of a sequence of a non-reinforced response followed by a reinforced one. This latter finding was confirmed with new animals in a follow-up experiment employing a conventional 24-sec DRL schedule.

Animals↗
PubMed1963

Effects of chlorpromazine and d-amphetamine on escape and avoidance behavior under a temporally defined schedule of negative reinforcement.

Chlorpromazine hydrochloride and d-amphetamine sulphate were administered to two rats responding on a baseline temporally defined schedule of negative reinforcement which produced both "escape-like" and "avoidance-like" behavior. The effects of these drugs appeared similar to those expected on the more customary sort of non-cued avoidance schedule.

Amphetamine↗
PubMed1963

EFFECTS OF VARYING CYCLE LENGTH IN A TAU REINFORCEMENT SCHEDULE.

A temporally defined reinforcement schedule within the tau system of classification was studied, with pigeons as subjects and with cycle length as the independent variable. As cycle length decreased, response rates increased, responses-per-reinforcement went through a maximum, while the number of reinforcements-per-session increased. The first two functions are attributed to changes in the discriminability of the tau(D) and tau(Delta) components of the cycle, while the latter seems to result from changes in the relative durations of reinforcement time and tau(Delta) time.

Animals↗