While shopping at the supermarket, Gregory is distracted by a woman in his aisle who is having a loud argument on her phone. As he waits in line to check out, Gregory realizes his wallet is missing, stolen by the woman’s accomplice while Gregory’s attention was elsewhere. This best illustrates the impact of

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The question describes a scenario where Gregory is distracted by a loud argument and, during that distraction, his wallet is stolen by an accomplice. This illustrates how attention affects what we notice in the environment.
Option a: parallel processing. This term refers to the brain's ability to process multiple streams of information simultaneously. While parallel processing is a real concept, it does not specifically describe the failure to notice an unexpected object or event when attention is diverted, which is the core of this scenario.
Option b: change blindness. Change blindness is the failure to notice substantial changes in a visual scene when the change coincides with a visual disruption or is not attended to. In this vignette, the key feature is missing attention leading to failure to notice an unremarkable event (a theft) rather than failing to notice a change in a scene over time, so this is not the best fit.
Option c: inattentional blindness. This phenomenon occurs when an individual fails to perceive an unexpected stimulus that is in plain sight while their attention is engaged elsewhere. Gregory’s wallet disappearance happened while his attention was diverted, fitting this definition precisely.
Option d: blindsight. Blindsight describes the ability of people with certain kinds of brain damage to respond to visual information they do not consciously see. Since Gregory can’t consciously notice the theft due to distraction, blindsight would involve residual visual processing despite a lack of conscious awareness, which is not what the scenario depicts.
Overall, the situation best aligns with inattentional blindness, where an unexpected event goes unnoticed because attention was allocated elsewhere, rather than with the other phenomena, which involve different mechanisms of perception or awareness.

PSY 200 (003) Fall 2025 Introduction to Psychology (TR, 1:30pm)

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