Effects of instructional constraints on human fixed-interval performance

Area of Science:

• Behavioral psychology
• Human operant conditioning

Background:

• Fixed-interval (FI) schedules are fundamental in operant conditioning research.
• Human performance under FI schedules can be influenced by various factors beyond basic reinforcement principles.

Purpose of the Study:

• To investigate human behavior under a fixed-interval 27-second schedule.
• To examine the effects of response constraints and session duration on human FI performance.
• To explore the impact of response placement contingencies within the interreinforcement interval (IRI).

Main Methods:

• Human subjects were exposed to a fixed-interval 27-second schedule.
• Experimental conditions included instructions to limit responses per reinforcer and/or session duration.
• One group received additional contingencies for response placement within the IRI.

Main Results:

• Observed performance patterns were diverse, some resembling those in animal subjects under FI schedules.
• Instructions to minimize session duration decreased post-reinforcement pausing.
• Minimizing session duration increased overall reinforcement density compared to response-limiting instructions alone.

Conclusions:

• Human fixed-interval performance is highly sensitive to experimental manipulations.
• Extra-experimental contingencies, such as instructions, significantly shape behavior under FI schedules.
• Findings underscore the complexity of human operant behavior and its responsiveness to contextual factors.