Summary
"Blindness" by José Saramago presents a model of interpretive blindness (IB), an epistemic bias hindering learning from testimony. IB arises from a co-dependence between background beliefs and interpretation, amplified by contemporary testimony's argumentative completeness. This bias prevents agents from updating beliefs with new, incompatible data, as they discount challenging evidence and reinforce trust in existing, limited sources. The book argues that this dynamic process, where belief updates are reinforced by the interpretation of testimony, can lead to a self-perpetuating cycle of biased learning, even within sophisticated Bayesian frameworks designed to promote good epistemic practices.
The core argument is that individuals can become "interpretively blind" when their existing beliefs shape how they interpret incoming information, particularly from testimony. This leads to a discounting of contradictory evidence and a strengthened reliance on trusted, but potentially narrow, information sources. Readers learn about a specific cognitive bias that can lead to a rational persistence in flawed belief systems, even when faced with opportunities for learning. The book demonstrates how argumentative completeness in testimony, where sources can counter any doubt, exacerbates this issue, making it difficult to dislodge ingrained biases.
Key concepts
- Interpretive blindness (IB) — A bias preventing learning from testimony due to a co-dependence between background beliefs and interpretation.
- Argumentative completeness — A characteristic of testimony where authors can respond to and argue against doubts, reinforcing credibility.
- Bayesian setting — A mathematical framework for reasoning about probabilities and belief updates.
- Hierarchical Bayesian settings — An extension of Bayesian frameworks used for more complex belief structures.
- Discount and [co-dependence] — A situation where agents discount evidence incompatible with their beliefs due to a co-dependence with their sources.
From the book
IB is a special problem for learning from testimony, in which one acquires information only from text or conversation. We show that IB follows from a co-dependence between background beliefs and interpretation in a Bayesian setting and the nature of contemporary testimony. We argue that a particular characteristic contemporary testimony, argumentative completeness , can preclude learning in hierarchical Bayesian settings, even in the presence of constraints that are designed to promote good epistemic practices. 1 INTRODUCTION In this paper, we describe and analyze an as far as we know theoretically un-examined kind of bias, which we call interpretive blindness (IB). IB is exemplified by humans (and perhaps soon by sophisticated machine learning algorithms) whose beliefs are guided and…
Popular questions readers ask
- How would you explain "interpretive blindness" and its primary causes to someone completely unfamiliar with the term, without using any jargon from the text? What simple analogy could you use to illustrate its effect on learning?
- The text states that interpretive blindness "follows from a co-dependence between background beliefs and interpretation... and the nature of contemporary testimony." Elaborate on *how* this co-dependence and the specific characteristic of contemporary testimony (argumentative completeness) interact to prevent an agent from updating their beliefs, even when presented with new, incompatible data.
- How does "argumentative completeness," as described, differ from simpler forms of bias like confirmation bias or selective exposure? Why is this distinction crucial for understanding its impact on learning within both standard and hierarchical Bayesian frameworks?
- The authors claim that argumentative completeness can preclude learning "even in the presence of constraints that are designed to promote good epistemic practices." What specific "good epistemic practices" might they be referring to, and why do they prove insufficient against interpretive blindness when testimony is argumentatively complete?
- Given that interpretive blindness stems from relying on a restricted set of testimony sources, what practical strategies could an individual or a society employ to actively combat this bias in a modern information landscape dominated by social media and specialized interest groups?