Load and distinctness interact in working memory for lexical manual gestures.

Area of Science:

• Cognitive Psychology
• Linguistics
• Neuroscience

Background:

• The Ease of Language Understanding model posits that reduced stimulus distinctness elevates working memory load.
• Empirical evidence supports this in spoken language, but its generalizability to sign language is less understood.
• The role of computer gaming experience in modulating cognitive load for sign processing remains unexplored.

Purpose of the Study:

• To investigate if the distinctness-load interaction observed in spoken language applies to sign language processing in individuals unfamiliar with sign.
• To examine the influence of computer gaming experience on this interaction.
• To explore the underlying cognitive mechanisms involved in processing degraded sign stimuli.

Main Methods:

• A cohort of twenty sign-naïve young adults participated in an n-back working memory task.
• The task utilized manual gestures from sign language, with manipulated visual resolution and working memory load.
• Performance metrics were analyzed to assess the impact of stimulus degradation and task difficulty.

Main Results:

• Participant performance declined significantly under conditions of high working memory load and low visual resolution.
• An over-additive interaction between reduced sign resolution and increased working memory load was observed.
• This interaction occurred even without pre-existing semantic representations, suggesting a shared amodal mechanism.

Conclusions:

• Reduced visual distinctness of sign language stimuli demonstrably increases working memory load in sign-naïve individuals.
• A shared amodal mechanism appears to govern the processing of stimulus distinctness and working memory load, particularly under degraded conditions.
• Preliminary evidence suggests that computer gaming experience may modulate this cognitive mechanism, warranting further investigation.