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Introspecting on the Timing of One's Actions in a Visuo-Motor Synchronization Task.

Gzorea A, Rider D - Front Psychol (2011)

Bottom Line: By means of a new visuo-motor synchronization paradigm we test the frequently made proposition that one's feeling of having voluntarily made a decision to act is in fact postdictively established contingent on the outcome of his action rather than on its aim.Instead, response time distributions were bimodal for the shortest (0 ms) and longest (500 ms) SIs and widely spread for intermediate SIs.To all three questions asked, subjects' responses strongly correlated with SI itself (r = 0.62-0.76) and barely with their actual response times (r = 0.03-0.42).

View Article: PubMed Central - PubMed

Affiliation: Laboratoire Psychologie de la Perception, Université Paris Descartes and CNRS Paris, France.

ABSTRACT
By means of a new visuo-motor synchronization paradigm we test the frequently made proposition that one's feeling of having voluntarily made a decision to act is in fact postdictively established contingent on the outcome of his action rather than on its aim. Subjects had to (1) synchronize a key-press with the end of a random synchronization interval (SI) shorter or longer than their reaction time (RT) and (2) judge thereafter whether (Q1) SI had been long enough to allow synchronization, (Q2) their motor response had been "reactive" (i.e., close to their RT) or delayed, or (Q3) whether SI was short or long. SI was denoted by the filling-up time of an annular "gauge." In principle, the "synchronization" key-press should be reactive for SI ≤ RT and delayed in proportion with SI for SI > RT. Instead, response time distributions were bimodal for the shortest (0 ms) and longest (500 ms) SIs and widely spread for intermediate SIs. To all three questions asked, subjects' responses strongly correlated with SI itself (r = 0.62-0.76) and barely with their actual response times (r = 0.03-0.42). Hence subjects' introspective judgments on their trial-by-trial potential capability to synchronize their motor response (Q1) and on their reactive vs. delayed response mode reflected the objective cause of their action rather than being "corrupted" by its outcome (namely their actual response time). That subjects could not reliably decide whether their motor response was reactive or delayed implies that they did not have retrospective access to (or did not remember) their motor decisions which amounts to say that they could not decide on the intentionality of their actions.

No MeSH data available.


Percentage of “Yes” responses to Qs1-3 (circles, squares, and triangles, respectively) of a representative subject (SL) as a function of SI (A), RsT (B), and SI-RsT (C) together with the best cumulative Gaussian fits (sigmoids of corresponding colors). Insets show the respective means and SDs of the fits.
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Figure 3: Percentage of “Yes” responses to Qs1-3 (circles, squares, and triangles, respectively) of a representative subject (SL) as a function of SI (A), RsT (B), and SI-RsT (C) together with the best cumulative Gaussian fits (sigmoids of corresponding colors). Insets show the respective means and SDs of the fits.

Mentions: Figure 3 shows the percentages of “Yes” responses of the same representative participant as in Figures 2a1–a3 for each of the three questions asked (circles, squares and triangles for Q1, Q2, and Q3) together with the corresponding cumulative Gaussian fits as a function of SI (3a), RsT (3b), and SI-RsT (3c). Whatever the question asked, the steepest sigmoids (smallest σ) are obtained when the “Yes” responses are related to SI (σSI = 36.9 ± 1.7 ms), slightly shallower when related to SI-RsT (σSI-RsT = 43.1 ± 3.0 ms) and flat for all practical reasons when related to RsT (σRsT = 235.8 ± 102.2 ms). These observations are true for all participants (with two marginal exceptions out of 15 comparisons for Q1, subjects MD and CR) as shown in Table 1. While the possibility that subjects may have partially based their judgments on the SI-RsT difference cannot be entirely excluded, the present results show that this difference was not their main source of information.


Introspecting on the Timing of One's Actions in a Visuo-Motor Synchronization Task.

Gzorea A, Rider D - Front Psychol (2011)

Percentage of “Yes” responses to Qs1-3 (circles, squares, and triangles, respectively) of a representative subject (SL) as a function of SI (A), RsT (B), and SI-RsT (C) together with the best cumulative Gaussian fits (sigmoids of corresponding colors). Insets show the respective means and SDs of the fits.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3108554&req=5

Figure 3: Percentage of “Yes” responses to Qs1-3 (circles, squares, and triangles, respectively) of a representative subject (SL) as a function of SI (A), RsT (B), and SI-RsT (C) together with the best cumulative Gaussian fits (sigmoids of corresponding colors). Insets show the respective means and SDs of the fits.
Mentions: Figure 3 shows the percentages of “Yes” responses of the same representative participant as in Figures 2a1–a3 for each of the three questions asked (circles, squares and triangles for Q1, Q2, and Q3) together with the corresponding cumulative Gaussian fits as a function of SI (3a), RsT (3b), and SI-RsT (3c). Whatever the question asked, the steepest sigmoids (smallest σ) are obtained when the “Yes” responses are related to SI (σSI = 36.9 ± 1.7 ms), slightly shallower when related to SI-RsT (σSI-RsT = 43.1 ± 3.0 ms) and flat for all practical reasons when related to RsT (σRsT = 235.8 ± 102.2 ms). These observations are true for all participants (with two marginal exceptions out of 15 comparisons for Q1, subjects MD and CR) as shown in Table 1. While the possibility that subjects may have partially based their judgments on the SI-RsT difference cannot be entirely excluded, the present results show that this difference was not their main source of information.

Bottom Line: By means of a new visuo-motor synchronization paradigm we test the frequently made proposition that one's feeling of having voluntarily made a decision to act is in fact postdictively established contingent on the outcome of his action rather than on its aim.Instead, response time distributions were bimodal for the shortest (0 ms) and longest (500 ms) SIs and widely spread for intermediate SIs.To all three questions asked, subjects' responses strongly correlated with SI itself (r = 0.62-0.76) and barely with their actual response times (r = 0.03-0.42).

View Article: PubMed Central - PubMed

Affiliation: Laboratoire Psychologie de la Perception, Université Paris Descartes and CNRS Paris, France.

ABSTRACT
By means of a new visuo-motor synchronization paradigm we test the frequently made proposition that one's feeling of having voluntarily made a decision to act is in fact postdictively established contingent on the outcome of his action rather than on its aim. Subjects had to (1) synchronize a key-press with the end of a random synchronization interval (SI) shorter or longer than their reaction time (RT) and (2) judge thereafter whether (Q1) SI had been long enough to allow synchronization, (Q2) their motor response had been "reactive" (i.e., close to their RT) or delayed, or (Q3) whether SI was short or long. SI was denoted by the filling-up time of an annular "gauge." In principle, the "synchronization" key-press should be reactive for SI ≤ RT and delayed in proportion with SI for SI > RT. Instead, response time distributions were bimodal for the shortest (0 ms) and longest (500 ms) SIs and widely spread for intermediate SIs. To all three questions asked, subjects' responses strongly correlated with SI itself (r = 0.62-0.76) and barely with their actual response times (r = 0.03-0.42). Hence subjects' introspective judgments on their trial-by-trial potential capability to synchronize their motor response (Q1) and on their reactive vs. delayed response mode reflected the objective cause of their action rather than being "corrupted" by its outcome (namely their actual response time). That subjects could not reliably decide whether their motor response was reactive or delayed implies that they did not have retrospective access to (or did not remember) their motor decisions which amounts to say that they could not decide on the intentionality of their actions.

No MeSH data available.