Influence of encoding difficulty, word frequency, and phonological regularity on age differences in word naming

Area of Science:

• Cognitive Psychology
• Neuroscience of Aging
• Human Perception

Background:

• Older adults exhibit slower word recognition compared to younger adults.
• The underlying mechanisms for this age-related difference remain incompletely understood.
• Potential factors include sensory processing, lexical access, and phonological encoding.

Purpose of the Study:

• To investigate age-related differences in visual word recognition.
• To determine the impact of orthographic encoding, lexical access, and phonological regularity on word recognition speed in older and younger adults.
• To test the hypothesis that older adults use larger perceptual units to compensate for sensory slowing.

Main Methods:

• Two word-naming studies were conducted with older and younger adult participants.
• Participants' word recognition was assessed under varying conditions of case type, word frequency, and phonological regularity.
• Behavioral data on word recognition times and accuracy were collected and analyzed.

Main Results:

• Older adults demonstrated significantly larger effects of case mixing compared to younger adults.
• No age differences were observed in the effects of word frequency or phonological regularity.
• Both age groups showed main effects for word frequency and phonological regularity.

Conclusions:

• Lexical access skills remain stable across the lifespan for both orthographic/semantic and phonological routes.
• Older adults' slower word recognition is attributed to increased time needed to normalize degraded sensory information.
• Age-related slowing in word recognition is primarily a perceptual normalization issue, not a deficit in lexical access.