Summary
William James's "The Principles of Psychology" argues that mental manifestations are directly dependent on cerebral conditions, with pursuit of ends and choice as defining marks of mind. The work explores how the brain's structure and activity, including the summation of stimuli, cerebral blood-supply, and the effects of habit stemming from neural plasticity, underpin psychological processes. It also examines the brain's functions in governing reflex, semi-reflex, and voluntary acts, detailing the localization of function within the hemispheres.
The book investigates the nature of consciousness, describing it as a personal, ever-changing, and continuous stream with "substantive" and "transitive" parts, often characterized by feelings of relation and tendency. It delves into concepts like attention, conception, discrimination, comparison, association, memory, and the perception of time, grounding these phenomena in neural mechanisms and the interplay of mental states. James also critiques theories such as the automaton-theory and mind-stuff theory, emphasizing psychology as a natural science that utilizes introspection and experiment while acknowledging potential sources of error like the "Psychologist's fallacy."
Key concepts
- The Psychologist's fallacy — A source of error in psychological study where the observer's knowledge is projected onto the observed.
- Stream of Thought — Consciousness is described as a personal, continuous, and ever-changing flow with "substantive" and "transitive" parts.
- Habit — Produced by the plasticity of neural matter, habit leads to ease of action and diminished attention.
- Weber's law — Describes the measurement of discriminative sensibility, relating the magnitude of differences to sensory perception.
- Primary memory — A concept within memory analysis, referring to the immediate retention and reproduction of sensory experience.
- Association by contiguity — An elementary law of association positing that thoughts connect based on their proximity in experience.
From the book
The right trigger makes no effort to discharge the left barrel if the
Goltz found that frogs deprived of their cerebral hemispheres would
Another brilliant German author, Liebmann,[2] argues against the