Working Memory Capacity and Its Relation to Stroop Interference and Facilitation Effects in Individuals With Mild Cognitive Impairment Purpose The purposes of the study were to investigate (a) the task-specific differences in short-term memory (STM) and working memory capacity (WMC) in individuals with mild cognitive impairment (MCI) and normal elderly adults (NEAs), (b) the Stroop interference and facilitation effects, and (c) the relationship of STM and WMC to ... Supplement Article
Supplement Article  |   May 01, 2012
Working Memory Capacity and Its Relation to Stroop Interference and Facilitation Effects in Individuals With Mild Cognitive Impairment
 
Author Affiliations & Notes
  • Jee Eun Sung
    Ewha Womans University, Seoul, South Korea
  • Jin Hee Kim
    Ewha Womans University, Seoul, South Korea
  • Jee Hyang Jeong
    Ewha Womans University Medical Center, Seoul, South Korea
  • Heejin Kang
    Ewha Womans University Medical Center, Seoul, South Korea
  • Correspondence to Jee Eun Sung: jeesung@ewha.ac.kr
  • Editor: Swathi Kiran
    Editor: Swathi Kiran×
  • Associate Editor: Michael Dickey
    Associate Editor: Michael Dickey×
Article Information
Attention, Memory & Executive Functions / Supplement: Select Papers From the 41st Clinical Aphasiology Conference
Supplement Article   |   May 01, 2012
Working Memory Capacity and Its Relation to Stroop Interference and Facilitation Effects in Individuals With Mild Cognitive Impairment
American Journal of Speech-Language Pathology, May 2012, Vol. 21, S166-S178. doi:10.1044/1058-0360(2012/11-0101)
History: Received August 15, 2011 , Accepted February 3, 2012
 
American Journal of Speech-Language Pathology, May 2012, Vol. 21, S166-S178. doi:10.1044/1058-0360(2012/11-0101)
History: Received August 15, 2011; Accepted February 3, 2012

Purpose The purposes of the study were to investigate (a) the task-specific differences in short-term memory (STM) and working memory capacity (WMC) in individuals with mild cognitive impairment (MCI) and normal elderly adults (NEAs), (b) the Stroop interference and facilitation effects, and (c) the relationship of STM and WMC to the Stroop effects.

Method Thirty-two individuals participated in the study (n = 16 for each group). WMC demands were increased using a computerized Stroop-like token task to add more linguistic units. Six STM and WMC measures were administered overall.

Results Digit-related tasks and an alphabet span task sensitively differentiated individuals with MCI from the NEA group. The group with MCI exhibited greater Stroop interference effects than the NEA group, but the 2 groups did not exhibit different Stroop facilitation effects. WMC significantly predicted performance on the response time analyses but not on the error rate analyses.

Conclusion Task-specific differences emerged in the group with MCI, and a reduced WMC accounts for the impaired inhibitory and goal maintenance processes. It is critical that WMC demands be systematically manipulated to tax individuals' WMC in a way that can clearly demonstrate their deficits, especially in individuals who are at risk for clinically demented states.

Acknowledgments
This work was supported in part by a Lee Seung Whan Scholarship honored to the second author (Jin Hee Kim).
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