Questions: Lexical Frequency Effects in Word Processing

Question 1

In a lexical decision task, participants recognize 'house' about 150 ms faster than 'effigy.' What is the most likely explanation?

• A. 'House' is shorter, and shorter words are always recognized faster due to reduced visual processing load
• B. 'House' has higher resting activation in the mental lexicon from more frequent lifetime exposure, so it reaches threshold faster
• C. 'Effigy' has more complex spelling patterns that require extra grapheme-phoneme conversion steps
• D. 'House' has more semantic associations, giving the mental lexicon more entry points to retrieve it

Answer: (B)

Frequency effects are explained by activation threshold theory: frequent words have strengthened neural representations with higher resting activation, so a smaller input signal is needed to push them over recognition threshold. Word length, spelling complexity, and semantic richness all have some effect, but frequency is the primary and most robust predictor — and frequency effects appear in the earliest neural markers (N200, N400) before higher-level processing like semantic association retrieval has occurred.

Question 2

A child encounters the word 'ephemeral' for the first time at age 8. By age 18, having read it approximately 500 times, how should their recognition speed for 'ephemeral' compare to age 8?

• A. It should be unchanged — once a word is fully learned, recognition speed stabilizes and doesn't improve further
• B. It should be slower — repeated exposure leads to habituation, making responses more deliberate
• C. It should be faster — each encounter strengthens the lexical representation, lowering its activation threshold
• D. Only pronunciation speed improves; visual recognition speed is fixed by spelling regularity

Answer: (C)

Frequency effects are cumulative and ongoing. Each encounter with a word strengthens its lexical representation — essentially lowering the effective activation threshold — so recognition speed increases with accumulated exposure. This is why 'ephemeral' goes from a slow, effortful recognition at first encounter toward faster, more automatic recognition after hundreds of encounters. The effect plateaus but does not disappear.

Question 3

Lexical frequency effects appear in the earliest measurable neural responses to words (EEG markers like N200), suggesting that frequency shapes the recognition process itself rather than just a post-recognition decision.

• T. True
• F. False

Answer: True

True. If frequency only affected a post-recognition decision (such as deciding whether to press the button), its effect would appear late in the EEG signal. The fact that it appears in early components (N200: ~200 ms, N400: ~400 ms) that reflect perceptual and pre-semantic processing is strong evidence that frequency modulates the recognition process itself — i.e., how quickly the word form achieves threshold activation.

Question 4

High-frequency words are recognized faster because the mental lexicon is organized as a sorted list, searching from most-common to least-common words until a match is found.

• T. True
• F. False

Answer: False

False. This describes the serial search model, which predicts discrete steps and is inconsistent with several findings — particularly the graded, continuous nature of frequency effects across the full frequency range. The better-supported account is activation threshold theory: all words are accessible in parallel, but high-frequency words have higher resting activation levels and reach threshold faster. Connectionist models, which naturally produce graded activation, are strongly preferred over serial search models in the field.

Question 5

Why does reading volume in childhood predict vocabulary breadth and reading fluency in adulthood, according to the lexical frequency framework?

Model answer: Wide reading exposes children to a large number of words repeatedly. Each encounter strengthens lexical representations — lowering activation thresholds and making recognition faster. Words encountered hundreds of times reach near-automatic recognition speeds, freeing cognitive resources for comprehension rather than decoding. Broader reading also exposes children to lower-frequency words that would not appear in limited reading, expanding the range of words with robust representations. The result is both a broader vocabulary (more words recognized at all) and greater fluency (high-frequency words processed automatically).

The key is that vocabulary acquisition is not just about knowing meanings — it is about building robust, fast-access lexical representations through cumulative exposure. Reading volume is a proxy for total word-encounter frequency across the lexicon.