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Related Experiment Video

Updated: May 21, 2026

Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats
08:06

Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats

Published on: June 18, 2018

Color-modulated olfactory testing using RAPPIT: An innovative tool for early detection of cognitive decline.

Sally Arnhardt1, Satnam Singh2, Kristin Steinebach1

  • 1Department of Psychiatry and Psychotherapy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.

Journal of Alzheimer'S Disease : JAD
|May 20, 2026
PubMed
Summary
This summary is machine-generated.

A new color-modulated olfactory test, RAPPIT, detects cognitive decline by measuring multisensory interference. This rapid, applicable identification test shows promise for early detection of cognitive impairment in older adults.

Keywords:
Alzheimer's diseaseMontreal Cognitive Assessmentagingcognitioncognitive screeningcognitive testingmild cognitive impairmentneurodegenerationolfactionvision

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Related Experiment Videos

Last Updated: May 21, 2026

Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats
08:06

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Published on: June 18, 2018

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06:40

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Published on: June 15, 2015

Olfactory Assays for Mouse Models of Neurodegenerative Disease
07:27

Olfactory Assays for Mouse Models of Neurodegenerative Disease

Published on: August 25, 2014

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sensory Processing

Background:

  • Olfactory and visual processing are key biomarkers for cognitive impairment.
  • Unimodal assessments may miss early deficits in higher-order cognitive integration.
  • Multisensory processing, especially under incongruent cues, challenges inhibitory control, a function vulnerable in early neurodegeneration.

Purpose of the Study:

  • To develop and validate RAPPIT (Rapid, massively APPlicable Identification Test), a novel color-modulated olfactory test.
  • To assess multisensory interference as an early marker for cognitive decline.
  • To evaluate RAPPIT's utility in clinical and home settings for early detection of cognitive impairment.

Main Methods:

  • RAPPIT utilizes 16 physically presented odors with a digital application for task control and response recording.
  • Odor identification accuracy was assessed using color backgrounds (MONEX-40) that were either congruent or incongruent with the odors.
  • 163 German participants completed the assessment; data analyzed for odor identification, color congruence effects (ΔE00), cognitive performance (MoCA), hedonic ratings, and depressive symptoms.

Main Results:

  • Odor identification accuracy decreased with age, with older adults (≥60 years) showing reduced performance under incongruent conditions.
  • Performance showed a non-linear relationship with color difference (ΔE00), declining at mid-range values.
  • Accuracy correlated significantly with Montreal Cognitive Assessment (MoCA) scores, indicating cognitive relevance.

Conclusions:

  • Multisensory interference effects, captured by comparing congruent and incongruent odor-color conditions, are cognitively relevant.
  • RAPPIT demonstrates utility beyond unimodal olfactory or visual assessments for detecting cognitive impairment.
  • The findings support RAPPIT's potential for early detection of cognitive decline in older adults in diverse settings.