Word-frequency effects on short-term memory tasks: evidence for a redintegration process in immediate serial recall

Area of Science:

• Cognitive Psychology
• Human Memory
• Psycholinguistics

Background:

• High-frequency words are recalled better than low-frequency words in short-term memory tasks.
• Previous research has not fully elucidated the underlying cognitive mechanisms driving this word frequency effect.
• Potential factors include speech rate and memory trace integrity.

Purpose of the Study:

• To investigate the mechanisms behind the high-frequency word advantage in short-term memory.
• To determine if speech rate influences the word frequency effect.
• To test a novel model of short-term memory incorporating redintegration.

Main Methods:

• Four experiments were conducted using short-term memory tasks.
• Experiment 1 manipulated word frequency and controlled for speech rate.
• Experiments 2-4 examined serial recall and backward recall effects across serial positions.
• A multinomial processing tree model was used for quantitative analysis.

Main Results:

• The word frequency effect on memory span was independent of speech rate.
• Word frequency significantly impacted serial recall, with effects increasing across serial positions.
• This word frequency effect was absent in backward recall tasks.
• The proposed redintegration model quantitatively fit the experimental data.

Conclusions:

• The advantage of high-frequency words in short-term memory is not due to speech rate.
• Memory trace redintegration, a process that repairs decaying memory traces, likely underlies this effect.
• The findings support a model where memory trace quality influences recall accuracy.