Sequential Effects in a Two-Choice Serial Reaction Task

Abstract

Twenty-four subjects performed a symbolic two-choice serial reaction task under four conditions. These were with a delay from previous response to onset of next stimulus of 100 millisec, 600 millisec., 2 sec., and a fourth condition of 2 sec. delay with verbal prediction of the next stimulus. A positive recency or repetition effect occurred at 100 millisec. delay where RTs to repeated stimuli were faster than RTs to alternate stimuli. At 600 millisec. this effect was still present, though much reduced. The 2 sec. delay gave a negative recency effect where RTs were slower to repeated than to alternate stimuli. This effect increased significantly with simultaneous prediction of the next stimulus. The verbal predictions themselves displayed negative recency. Run analysis of the four conditions revealed striking differences. These results emphasize the need for analysing the microstructure of choice RT situations and reveal deficiencies in present models.

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References

Bertelson

(1961). Sequential redundancy and speed in a serial two-choice responding task. Quart. J. exp. Psychol. 13, 90–102.

Bertelson

(1963). S-R relationships and reaction times to new versus repeated signals in a serial task. J. exp. Psychol. 65, 478–84.

Bertelson

(1965). Serial choice reaction-time as a function of response versus signal-and-response repetition. Nature 206, 217–8.

Bertelson

Renkin

(1966). Reaction times to new versus repeated signals in a serial task as a function of response-signal time interval. Acta Psychol. 25, 132–6.

Falmagne

J. C.

(1965). Stochastic models for choice-reaction times, with application to experimental results. J. math. Psychol. 2, 77–124.

Feldman

(1959). On the negative recency hypothesis in the prediction of a series of binary symbols. Amer. J. Psychol. 72, 597–9.

Goodnow

J. J.

(1955). Response sequences in a pair of two-choice probability situations. Amer. J. Psychol. 68, 624–30.

Hansen

C. F.

(1922). Serial action as a basic measure of motor capacity. Psychol. Monogr. 31, 320–82.

Hyman

(1953). Stimulus information as a determinant of reaction time. J. exp. Psychol. 45, 188–96.

10.

Jarvik

M. E.

(1946). Probability discrimination and the gambler's fallacy in guessing. Amer. Psychologist 1, 453–4.

11.

Jarvik

M. E.

(1951). Probability learning and the negative recency effect in the serial anticipation of alternative symbols. J. exp. Psychol. 41, 291–7.

12.

Leonard

J. A.

Newman

R. C.

Carpenter

(1966). On the handling of heavy bias in a self-paced task. Quart. J. exp. Psychol. 18, 130–41.

13.

Nicks

D. C.

(1959). Prediction of sequential two-choice decisions from event runs. J. exp. Psychol. 57, 105–14.

14.

Rabbitt

P. M. A.

Rodgers

(1965). Age and choice between responses in a self paced repetitive task. Ergonomics 8, 435–44.

15.

Welford

A. T.

(1959). Evidence of a single-channel decision mechanism limiting performance in a serial reaction task. Quart. J. exp. Psychol. 11, 193–210.

16.

Welford

A. T.

(1960). The measurement of sensory-motor performance: a survey and reappraisal of 12 years progress. Ergonomics 3, 189–227.

17.

Williams

J. A.

(1966). Sequential effects in disjunctive reaction time: implications for decision models. J. exp. Psychol. 71, 665–72.

18.

Winefield

A. H.

(1966). Negative recency and event independence. Quart. J. exp. Psychol. 18, 47–54.