Do we form habits from repetition or just our last action?

What are the two dominant historical accounts of habit acquisition discussed in the introduction?

The two dominant accounts are based on either the "law of effect" (reinforcement history) or the "law of exercise" (mere repetition).

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How does the "law of effect" explain the strength and likelihood of a habit?

It posits that habit strength is a direct function of reinforcement history, where rewarded responses are more likely to occur again and punished responses are less likely.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What is the core assertion of the "law of exercise" in early learning psychology?

It asserts that habits emerge purely from repeating the same behavior in the same situation over and over again, independent of reinforcement.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

Why is the outcome devaluation paradigm used in habit research?

It is used to assess habitual behavior that has become independent of rewards or outcomes, demonstrating that overlearned behaviors persist even when the outcome is no longer reinforcing.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How is a habit broadly defined in terms of cognitive automaticity and behavior?

A habit is defined as automatic operant behavior elicited by certain stimuli or situations, resulting from learning or experience.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What is the "law of recency" proposed by the authors of this study?

It is an instance-based account proposing that executing a behavior once in a situation increases the likelihood of repeating it the next time that situation is encountered, even without reward or multiple repetitions.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What does the episodic response retrieval account argue is the underlying driver of repetition-based habits?

It argues that retrieving the memory of the most recent episode of a stimulus, along with its bound response, drives current responding.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How does the "law of recency" differ theoretically from the "law of exercise"?

The law of recency asserts that the single most recent episode drives responding, whereas the law of exercise asserts that global frequency or contingency of all past trials is the decisive factor.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How are stimulus-response binding and retrieval (SRBR) effects typically assessed in a sequential trial design?

They are assessed by orthogonally manipulating whether the stimulus repeats/changes and whether the response repeats/changes from trial n-1 to trial n.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

Why did the researchers design a paradigm that did not contain any external rewards?

To provide a pure test of repetition-based habits and rule out any influence of reinforcement on the emergence of habits.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What paradigm did the researchers modify to test habit formation in the absence of reinforcement?

They used a modified color-word contingency learning (CL) paradigm.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

Why were the contingency rules in this study designed to be weak and complex?

Weak and complex contingencies (e.g., pairing one stimulus with two colors) made them harder to detect, ensuring learning was incidental and not a conscious, strategic S-R rule.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What were the contingency ratios used in Experiment 1 and Experiment 2, respectively?

Experiment 1 used a contingency ratio of 2:1, while Experiment 2 used a stronger contingency ratio of 4:1.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How does episodic retrieval explain why performance is faster on high contingency trials in the color-word paradigm?

Because the stimulus is more often paired with the high contingency response, retrieving the last episode is statistically more likely to activate the correct response, facilitating performance.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What was the key prediction regarding the effect of controlling for episodic response retrieval on the global contingency learning (CL) effect?

The researchers predicted that controlling for the differences in response retrieval effects would eliminate (or substantially reduce) the global CL effect.

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What incentive was provided to participants in Experiment 1 to encourage speed and accuracy?

Participants received base payment plus a chocolate bar or ice cream voucher if they achieved more than 80% of reaction times faster than 1000 ms and less than 15% errors.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What were the four monosyllabic German adjectives used as word stimuli in the experiments?

The adjectives were "warm" (warm), "klein" (small), "ganz" (whole), and "fast" (almost).

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How were immediate trial sequences designed to systematically analyze SRBR effects in Experiment 1?

They manipulated Stimulus Relation (repetition vs. change) orthogonally with Response Relation (repetition vs. change) from trial n-1 to trial n.

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Why was the "SR-RR" sequence analysis restricted only to trial sequences with matching contingencies?

Because if both the stimulus and response repeat, the contingency of trial n must match trial n-1, making mismatch sequences impossible.

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What was the key contingency learning (CL) effect finding for reaction times in Experiment 1?

High-contingency trials were significantly faster than low-contingency trials by 6 milliseconds.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What happened to the main effect of contingency in Experiment 1's reaction times once researchers controlled for episodic response retrieval?

The main effect of contingency was no longer significant, indicating that episodic response retrieval fully explained the contingency learning effect.

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In Experiment 1, how did distance (immediate vs. non-immediate stimulus repetition) affect the strength of response retrieval effects?

Response retrieval effects were significantly stronger for immediate stimulus repetitions but remained significant even for more distant repetitions.

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Based on multi-level analyses in Experiment 1, at what distance did the effect of response retrieval become zero?

The effect of response retrieval became zero at a distance between 5 and 6 trials.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What interaction signature is typical of stimulus-response binding and retrieval (SRBR) effects?

An interaction where repeating the stimulus speeds up performance for response repetitions, but slows it down for response changes.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

Why did the authors run Experiment 2 with a stronger contingency manipulation of 4:1?

To boost the contingency learning effect to ensure it was highly reliable, so that its elimination through response retrieval controls could not be dismissed as an artifact of a weak effect.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How was the large number of potential trials (1600) managed for participants in Experiment 2?

The list was split among groups of three participants, resulting in 535 experimental trials per participant while keeping trial sequence balance.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What was the contingency learning (CL) effect on error rates in Experiment 2?

There was a significant difference of 1.6%, meaning participants committed fewer errors on high-contingency trials than on low-contingency trials.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How did the multi-level analysis of Experiment 2 confirm the findings of Experiment 1 regarding the main effect of contingency?

It showed that while contingency predicted reaction times when analyzed in isolation, adding previous response as a predictor rendered the contingency effect completely non-significant.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

At what trial distance did the effect of response retrieval become zero in Experiment 2?

The effect of response retrieval became zero at a distance between 6 and 7 trials.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How does the Parallel Episodic Processing (PEP) model mathematically conceptualize the law of recency?

It conceptualizes the law of recency through an instance-based retrieval of previous stimulus-response episodes, simulating response times and error rates across speeded tasks.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What is a key methodological advantage of using reaction times rather than response frequencies to study habits in humans?

Speed of responding is much less controllable than executing a specific response, making reaction times a better measure of automatic, uncontrollable processes.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

Why do the findings in this study represent repetition-based rather than reward-based habits?

Because the contingency learning was achieved without linking responses to external rewards, showing that reinforcement is not necessary for habit acquisition.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

Why is the performance benefit of high-contingency trials unlikely to act as a significant "implicit reward" for participants?

The reaction time difference was extremely small (less than 10 ms) and likely imperceptible, while also carrying a notable cost of a 20% increase in errors for low-contingency trials.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

How did the procedural feedback change in Experiment 2 compared to Experiment 1?

In Experiment 2, whenever a timing or response error occurred, participants had to press the correct response key to continue, instead of pressing the "go" key.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified

What general conclusion does the study reach regarding the relationship between short-term stimulus-response binding and long-term habit formation?

Short-term episodic stimulus-response binding and retrieval is the foundational mechanism that, when accumulated, explains longer-term contingency learning and habit formation.

Source: The Law of Recency: An Episodic Stimulus-Response Retrieval Account of Habit Acquisition · DOI · quote verified