Memory for pictures and words as a function of level of processing: Depth or dual coding?

Area of Science:

• Cognitive Psychology
• Memory Research
• Cognitive Neuroscience

Background:

• Dual-coding theory suggests distinct verbal and non-verbal processing systems.
• Depth-of-processing theory posits memory depends on cognitive effort.
• Previous research has explored how different encoding strategies affect memory recall.

Purpose of the Study:

• To test competing predictions from dual-coding and depth-of-processing theories.
• To investigate the impact of structural, phonemic, and semantic processing on memory.
• To examine memory performance for pictures, concrete words, and abstract words.

Main Methods:

• Incidental memory task with free recall of 36 events presented twice.
• Three processing conditions: structural, phonemic, and semantic.
• Stimuli included pictures, concrete words, and abstract words presented to separate subject groups.

Main Results:

• Concrete word retention increased with processing depth (structural < phonemic < semantic).
• Abstract words and pictures yielded similar memory performance for phonemic and semantic processing.
• Data strongly supported the dual-coding model over depth-of-processing for the tested conditions.

Conclusions:

• The findings provide robust evidence for the dual-coding model in explaining memory encoding.
• Differential effects of processing depth were observed for concrete words versus abstract words and pictures.
• The study highlights the importance of stimulus type in memory recall and encoding strategies.