What Is Working Memory Capacity?

How do the authors distinguish between working memory and working-memory capacity (WMC)?

Working memory refers to the hypothetical cognitive system responsible for providing access to information required for ongoing processes, while working-memory capacity (WMC) is the individual differences construct reflecting this system's limited capacity.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What is the core claim of the executive-attention view of working memory capacity?

It posits that WMC is not primarily about storage or memory capacity, but rather about the capacity for controlled, sustained attention when facing interference or distraction.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

In the saccade task by Kane et al., how did high-span and low-span participants perform in the prosaccade versus antisaccade conditions?

Low-span participants were slower and less accurate than high-span participants in the distracting antisaccade condition, whereas the two groups did not differ in the prosaccade condition.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What is a major methodological limitation of using extreme-group comparisons in individual differences research?

Although extreme-group comparisons are highly effective for detecting individual differences, they are ill-suited for estimating effect sizes because they tend to overestimate effects in the population.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

Why is testing executive attention with a single experimental paradigm problematic?

Using a single paradigm conflates the variance caused by individual differences in executive control with the variance unique to that specific task.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What three separate but positively correlated executive-function factors were identified in the seminal study by Miyake et al. (2000)?

Miyake et al. identified inhibition, task-set shifting, and working memory updating.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What does previous latent-factor evidence suggest about the correlation between WMC and the shifting and inhibition factors of executive control?

The cumulative evidence points to a positive but relatively modest (not very high) correlation between WMC and both shifting and inhibition.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What three factors can explain the low correlations between the traditional n-back task and other WMC measures in previous studies?

The low correlations are due to: (1) using single indicators, (2) mismatching content domains (e.g., spatial vs. verbal), and (3) mismatching memory test methods (recognition vs. recall).

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

According to Unsworth and Engle's dual-store model, what two components determine performance in complex-span tasks?

Performance is characterized as a composite of active maintenance in primary memory (PM) and controlled retrieval from secondary memory (SM).

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

Why do complex-span tasks rely more heavily on secondary memory (SM) than simple-span tasks do, according to dual-store models?

Because part of primary memory's limited capacity is consumed by the distractor task, which displaces list items and forces greater reliance on secondary memory.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What causes retrieval from secondary memory (SM) to be a difficult, error-prone search process?

It is a cue-dependent search process that is vulnerable to proactive interference, encoding deficits, and output interference.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

According to the dual-store view, what basic processes are shared between simple-span and complex-span tasks, and how do they differ?

They share the same fundamental subcomponent processes (such as rehearsal, maintenance, updating, and controlled search) but differ in the extent to which these processes operate.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What is the core definition of working memory according to the binding hypothesis?

It defines working memory as a cognitive system dedicated to building, maintaining, and rapidly updating arbitrary bindings.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

According to the binding hypothesis, why does the limited capacity of working memory restrict reasoning ability?

The limit arises from interference between bindings, which restricts the complexity of new structural representations that can be constructed and manipulated.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

In short-term recognition performance, which component of memory is uniquely correlated with WMC, according to the binding hypothesis?

Recollection (but not familiarity) is correlated with WMC because recollection specifically reflects the active maintenance of temporary item-context bindings.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

Why should working-memory updating tasks serve as excellent measures of WMC according to the binding hypothesis?

Updating tasks like n-back require the rapid, continuous updating of temporary bindings between items and their positions or spatial locations.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

Why is secondary memory (SM) expected to be virtually useless for performing working-memory updating tasks?

Because the rapid, repeated updating of items creates massive proactive interference in SM, making SM unsuitable for their maintenance.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What six categories of cognitive tests did the researchers administer to study the predictions of the three theories?

The categories were: complex-span, working memory updating, immediate memory for temporary bindings, secondary memory for associations, response inhibition, and fluid intelligence.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

According to the executive-attention theory, which task classes should correlate highly, and what should their shared variance predict?

Complex span tasks should correlate highly with both Updating and Inhibition tasks, and their shared variance (reflecting general executive attention) should predict fluid intelligence.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

How does the dual-component theory predict the relationship between secondary memory (SM), complex-span tasks (Cspan), and updating tasks?

Complex-span tasks should correlate with both SM and primary memory (Updating), whereas SM and Updating should be relatively weakly correlated with each other.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

According to the binding hypothesis, why are updating tasks closely related to other measures of WMC and to fluid intelligence?

Because they reflect the maintenance of temporary bindings, rather than representing executive attention.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What was the sample size, mean age, and gender distribution of the final participant sample analyzed in this study?

The final sample consisted of 262 participants, with a mean age of 27.41 years, of which 56% were female.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What was the physical procedure and time commitment required from the participants during the study?

Participants completed two testing sessions, each lasting approximately 3 hours including breaks, with an interval of 4 to 6 days between sessions.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

How was the processing/distractor component of the Rotation Span task structured?

Participants decided whether a rotated letter (G, F, or R) presented in the middle of the screen was in its normal or mirror-reversed orientation.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

How did the researchers structure the verbal updating task to measure working memory updating?

Participants kept track of the last word presented for 2 to 5 semantic categories across a series of 2 to 6 unpredictable updating steps and typed them at the end.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

How did the spatial-figural updating task measure the updating of locations in working memory?

Colored rectangles appeared one at a time within a 3x3 grid; participants had to track and recall the last position where each color had appeared.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

How did the "Recall N-back" (RNb) tasks in this study differ from traditional recognition-based n-back tasks?

Instead of making recognition match decisions, participants had to actively type or click to recall the actual identity of the stimulus that was presented previously.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

How did the letter-color binding task ensure it measured memory for associations rather than memory for individual items?

It used a small set of letters and colors repeatedly across trials, meaning accuracy depended entirely on memory for the current trial's pairings rather than recognizing items.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

How did the design of secondary memory (SM) tasks ensure that recall relied entirely on secondary memory rather than working memory?

They used longer list lengths to exceed primary memory capacity and included a 3-minute filler task between encoding and recall to clear working memory.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What three content domains were assessed in the Berlin Test of Fluid and Crystallized Intelligence (BEFKI) to measure fluid intelligence?

Fluid intelligence was measured using a verbal subtest (premises), a numerical subtest (arithmetic reasoning), and a figural subtest (geometric sequences).

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

How did the researchers define and handle outlier scores in their initial data screening?

Outliers were defined as values located above the whiskers of univariate boxplots (g = 1.5) and were set to missing values before being imputed.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What did the confirmatory factor analysis (Model 1) reveal about the latent correlations among Complex Span, Updating, and Recall N-back?

The latent factors were extremely highly correlated (r = 0.80 to r = 0.92), demonstrating that they are essentially measuring the same underlying construct.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What was the relationship between the Binding task factor and the general working memory capacity (WMC) factor in Model 2?

The Binding factor's standardized loading was set to 1.0 (perfect correlation) because its freely estimated loading did not differ significantly from one.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What was the latent correlation between the general WMC factor and Secondary Memory (SM) in Model 3?

The latent correlation was 0.79, indicating that WMC and SM are highly related but statistically distinct cognitive constructs.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified

What did the study find regarding the correlation between response inhibition conflict factors (Simon and Eriksen) and WMC?

No significant correlation was observed between WMC and the specific response conflict factors, challenging executive-attention views of WMC.

Source: What is working memory capacity, and how can we measure it? · DOI · quote verified