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The serial position effect is a cognitive phenomenon where individuals are more likely to recall the first and last items in a list compared to those in the middle. This effect is divided into the primacy effect and the recency effect. The primacy effect is observed when the initial items in a list are remembered better. This occurs because these items are rehearsed more frequently or receive more elaborative processing, allowing them to be encoded into long-term memory more effectively. For...
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Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
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Category length produces an inverted-U discriminability function in episodic recognition memory.

James H Neely1, Chi-Shing Tse

  • 1Department of Psychology, University at Albany, State University of New York, Albany, NY 12222, USA. jn562@albany.edu

Quarterly Journal of Experimental Psychology (2006)
|December 3, 2008
PubMed
Summary

Recognition memory for semantic categories peaks at category length 8. Performance is better with grouped category items, challenging current memory models.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Psycholinguistics

Background:

  • Understanding semantic category effects on recognition memory is crucial for cognitive models.
  • Previous research has explored how list composition influences memory recall.

Purpose of the Study:

  • To investigate the impact of semantic category length on recognition memory performance.
  • To examine how item spacing and order within categories affect memory accuracy.
  • To evaluate existing recognition memory models against empirical findings.

Main Methods:

  • Four experiments utilized signal detection analyses and word lists with varying semantic category lengths (CL).
  • Recognition memory was measured using d(a) and analyzed with z-coordinate receiver operating characteristic (z-ROC) functions.
  • Category length varied from 1 to 14 exemplars, with specific manipulations of item spacing and order.

Main Results:

  • Recognition memory performance, measured by d(a), increased with category length up to 8 items, then decreased.
  • Memory was enhanced when category exemplars were studied consecutively compared to being spaced apart.
  • The initial exemplars within blocked categories were recalled better than the final exemplars.
  • z-ROC functions were consistently linear with slopes less than 1.0, lacking significant quadratic components.

Conclusions:

  • Recognition memory for semantic categories exhibits an inverted U-shaped function with respect to category length.
  • Item grouping and serial position effects within categories significantly influence memory performance.
  • The findings present a significant challenge to established item-noise, context-noise, and dual-process models of recognition memory.