Causal Closure

Free Will and Causal Closure

Free Will Discussion

  • The discussion focuses on potential responses regarding free will, particularly in juxtaposition to dualism.
  • The transcript mentions a potential exam question related to the concept of causal closure.

Causal Closure versus Causal Completeness

  • Terms:

    • The terms "causal closure" and "causal completeness" are interchangeable in certain readings.

  • The concept appears to present a neutral perspective on physicalism and dualism, lacking a strong bias toward either position.

Descartes' View and Physical Causation

  • Descartes posited that every reflex has a full physical explanation.

  • He believed the mind has a separate, non-physical influence on the body, standing external to physical explanations.

  • Illustrative Diagram:

    • A big circle represents the physical realm. Non-physical aspects are outside this circle.
    • Blue dots signify events occurring within the physical world.

Example of Causal Trace

  • Base Example: In a baseball scenario, tracing the event of a window breaking can exemplify causal closure:
    1. Result Event: Window breaks.
    2. Immediate Cause: A baseball hits the window.
    3. Further Cause: The baseball's trajectory is influenced by the bat hitting it, which is initiated by the person swinging the bat.
    4. Underlying Cause: Muscle movement triggered by neuron activity.
  • The iterative process follows physical causation, establishing a chain of events that remains confined to the physical realm.

Principle of Causal Closure

  • The principle states: All physical events can be completely explained through a chain of prior physical events.
    • It is a backward-facing principle.
    • The term "closed" indicates a self-contained system.
  • Events are considered partially caused by a multitude of factors, but collectively they can fully account for a particular outcome.

Challenges and Questions

  • Does not address non-physical causes. Thus, remains neutral regarding mind-body interaction.
  • Possible events without known causes (e.g., Big Bang) are acknowledged but not directly addressed within the principle.

Interactionist Dualism Example

  • Reference to a reality show, “The Voice,” illustrates decision-making:

    1. Incident: Shakira pressing the button for a contestant.
    2. Analyzed from the perspective of causal closure.

  • Questions arise regarding the physical vs. non-physical decision-making process in this scenario, emphasizing the implications for dualism.

Exclusion Principle

  • Discussion about the exclusion argument:
    • It posits that no two full and distinct explanations can simultaneously account for a singular event.
    • If physical and non-physical explanations exist for the same event, one must be flawed.

Argument Structure Against Dualism

  • Premises of Argument:
    1. Mental events cause physical events (downward causation).
    2. All physical events have prior physical causes (causal closure).
    3. An event is fully caused by at most one sequence of prior events (exclusion).
    4. Conclusion: Interactionism is inadequate, suggesting physicalism may hold.
  • Implication: If premises hold true, the conclusions drawn against dualism must logically follow.

Relation to Modern Science and Physics Laws

  • Physics principles reinforce the idea of causal closure:
    • Current laws of physics maintain the relationship between physical events in the cosmos.
    • Examples of Laws:
    • Newton's Laws of Motion: Objects remain in rest or uniform motion unless acted upon.
    • Action-Reaction Principle: Every action has an equal and opposite reaction.
  • Confidence in these laws suggests a comprehensive understanding of physical interactions.

Evidence for Causal Closure

  • Four main reasons suggesting belief in causal closure:
    1. Current laws of physics do not consider non-physical properties.
    2. Absence of known counterexamples in established science.
    3. Advances in brain science help illuminate causal chains within physical systems.
    4. Technological advances increase confidence in fully explaining physical phenomena.

Implications and Closing Thoughts

  • The argument emphasizes a wager on the existence of non-physical causes.
    • If they exist, they must eventually be discoverable; the lack of evidence puts pressure on dualism.
  • The discussion reiterates the premise that physical explanations should underlie observable phenomena, reinforcing the philosophical inclination toward physicalism.

Questions and Clarifications

  • Clarifications were sought regarding:
    • The relationship between causes and explanations.
    • The possibility of multiple causes contributing to a single event.
    • The question surrounding initial events, such as the origins of the universe.
  • General inquiry about the principles of causation and how they restrict interpretations of mental events.

Importance of Definitions

  • Definition of what constitutes "physical" and "non-physical" events must be maintained in the philosophical discourse to clarify confusion.

Conclusion

  • If mental events are reliant on physical processes yet do not present sufficient transferable causes, likely, physicalism holds the affirmative stance against dualist perspectives.