According to Standing's 1973 study on episodic memory, approximately what percentage of 10,000 images were participants able to recognize after two days?

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We start by restating the question to anchor what we’re evaluating: According to Standing's 1973 study on episodic memory, approximately what percentage of 10,000 images were participants able to recognize after two days?

Option 1: 50% — This percentage would imply memory performance at the mid-range level, which would be surprisingly low for a large-scale image memory study. In Standing’s work, recognition after a two-day delay is substantially higher than this, so this figure underestimates the observed performance.

Option 2: 25% — This figure indicates a very weak memory for a large image set, far below what typical recognition studies report for familiarization with thousands of images. It contradicts the robust gist of Standing’s findings and would be an implausible result given the methodology.

Option 3: 70% — While 70% is a respectable recognition rate after two days, Standing’s iconic finding for this particular experiment centers around a higher level of recognition, and 70% would still fall short of the commonly cited estimate associated with his study.

Option 4: 90% — This option aligns with Standing’s famous result, where participants could recognize about 90% of the images after a two-day delay from a set of 10,000 pictures. It reflects the surprisingly high recognizability of a large image corpus after a short rest period, illustrating the strength of incidental encoding and familiarity effects observed in the study.

In summary, the options present a gradient of possible recognition levels, but the historical finding most frequently cited for Standing’s experiment is around 90%, making this the most accurate choice among the given figures. The other options misrepresent the magnitude of recognition that Standing reported, either by underestimating memory performance (50%, 25%, 70%) or by not matching the well-known 90% figure associated with the study.

PSC 135 001 SQ 2025 Lecture 24: Long-term Memory III

According to Standing's 1973 study on episodic memory, approximately what percentage of 10,000 images were participants able to recognize after two days?

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