Ranking tasks in recognition memory: A direct test of the two-high-threshold contrast model

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Memory

Background:

• Debate exists on whether memory signals directly inform recognition or operate via discrete states.
• Signal detection theory (SDT) posits direct signal influence, while the two-high-threshold (2HT) model suggests discrete states.
• Prior research by Kellen and Klauer (2014) supported SDT, but Malejka et al. (2022) challenged these findings.

Purpose of the Study:

• To directly test the memory-signal contrast mechanism proposed by Malejka et al. (2022) within the 2HT model framework.
• To compare the predictive accuracy of SDT models against the 2HT contrast model in recognition memory tasks.
• To provide empirical evidence clarifying the nature of latent memory signals in recognition judgments.

Main Methods:

• An empirical investigation was designed to specifically test the 2HT contrast mechanism.
• Participants' recognition judgments were analyzed under conditions manipulating the number of simultaneously presented new items alongside a single old item.
• The study contrasted predictions from SDT models with those from the proposed 2HT contrast mechanism.

Main Results:

• The 2HT contrast mechanism predicts a decrease in correct rejections of new items as their number increases when only one old item is present.
• SDT models predict an increase in correct rejections under the same conditions.
• Empirical results aligned with SDT predictions and contradicted the 2HT contrast model.

Conclusions:

• The findings refute the 2HT contrast mechanism as an explanation for recognition memory.
• This study strengthens the conclusions of Kellen and Klauer (2014), supporting SDT models.
• Evidence supports the view that latent memory signals directly determine recognition judgments.