Tolman (1948)

Introduction

  • The paper deals with experiments conducted primarily with rats to explore cognitive maps and their implications for understanding human behavior.

  • Most experiments were conducted in the Berkeley laboratory, and the author mentions research done by others, including those from out-of-state laboratories.

Description of Maze Experiments

  • Maze Types: The author describes two typical mazes:

    • Alley Maze

    • Elevated Maze

  • Experiment Design: In a typical experiment:

    • A hungry rat is placed at the entrance of a maze.

    • The rat wanders through the maze until it reaches a food box, with trials repeated every 24 hours.

    • Over time, the rat makes fewer errors (blind alley entrances) and reduces the time taken to reach the goal.

  • Data Presentation: Results are usually shown as average curves indicating blind entrances or time taken from start to finish across groups of rats.

Disagreement in Theories

  • Different schools of thought exist regarding how rats learn in mazes:

    1. Stimulus-Response School:

    • Learning consists of mere stimulus-response connections, which are strengthened or weakened over time.

    • This school views the rat's nervous system as a complex telephone switchboard where stimuli lead to behavioral responses based on sensory organs and internal stimuli.

    • Subgroups of this Theory:

      • Frequency Theory: More frequently presented stimuli lead to stronger connections with correct responses.

      • Reinforcement Theory: Appropriate responses followed by immediate need reductions (positive reinforcement) strengthen connections, while bad results (negative reinforcement) weaken them.

    1. Field Theory (author's position):

    • Proposes that learning involves constructing a cognitive map of the environment in the rat's brain.

    • This map is not a direct stimulus-response connection but a more autonomous and organized cognitive process.

    • The complexity of brain processes contributes to forming a tentative cognitive-like map used to guide behavior.

    • Narrow vs. Comprehensive Maps: Differentiates between narrow (strip-like) and broad (comprehensive) cognitive maps based on their ability to adapt to changes.

Types of Experiments Reported

  • The experiments reported fall into five categories:

    1. Latent Learning

    2. Vicarious Trial and Error (VTE)

    3. Searching for the Stimulus

    4. Hypotheses

    5. Spatial Orientation

1. Latent Learning Experiments

  • Conducted by Blodgett in 1929 using a six-unit alley maze:

    • Blodgett established three groups: a control group (food at the end of each trial) and two experimental groups (food withheld for varying days).

    • Observation: Experimental groups appeared to learn little during non-rewarded trials, but after rewards were introduced, their error rates dropped significantly, indicating prior latent learning.

    • Conclusion: Rats were developing a cognitive map even when not rewarded; they used this knowledge once motivation (food) was introduced.

2. Vicarious Trial and Error (VTE)

  • Defined by Prof. Muenzinger, refers to the behavior of hesitation or indecision rats often display at choice points before making a decision.

  • A visual discrimination task designed by Lashley was used to test VTE:

    • Rats had to differentiate between visual stimuli (e.g., striped doors).

    • Results showed that rats engaged in more VTE when the discrimination was easy than when it was difficult.

    • Suggests that VTE is a sign of learning as rats begin to understand task demands.

3. Searching for the Stimulus

  • Conducted by Hudson, explored avoidance learning:

    • Rats were exposed to a shock when approaching a food cup.

    • Results indicated that if the pattern associated with the shock was removed at the time of the shock, the rats did not learn to avoid it, suggesting active search behavior is vital in forming cognitive maps.

4. Hypothesis Experiments

  • Developed by Krech using a four-compartment discrimination box:

    • Rats displayed systematic choices, suggesting that they try different strategies (hypotheses) to solve problems, indicating the cognitive process in mapping their environment.

5. Spatial Orientation Experiments

  • Conducted by Tolman, Ritchie, and Kalish observed rats learning a maze:

    • Rats exhibited an understanding of broader spatial relationships, not just the trained path when given alternative routes.

    • They demonstrated awareness of food's direction, indicating broad cognitive maps rather than narrow ones.

Theoretical Implications for Human Behavior

  • The significance of these findings extends to understanding human cognitive processes.

  • Two main factors influencing map breadth:

    1. Narrow strip maps:

    • Induced by brain damage, inadequate environmental cues, excessive repetition of learned paths, and excessive motivation/frustration.

    1. Comprehensive maps:

    • Developed under moderate motivation and absence of unnecessary frustrations.

  • Applications in Psychology:

    • Narrow cognitive maps can indicate maladjustment and psychological mechanisms in humans such as regression, fixation, and displacement of aggression onto outgroups.

    • These mechanisms involve responses to strong frustrations that limit cognitive flexibility, resulting in maladaptive behavior.

Conclusion

  • To foster wider cognitive maps in both rats and humans, it is vital to ensure optimal conditions of motivation and minimize frustration.

  • Emphasis on education and upbringing conditions that promote broad perspectives in learning and problem-solving.

  • The overall goal is to cultivate an understanding of interdependence across diverse groups and to allow for a rational and comprehensive approach to human behavior and societal interactions.