# Correction to: Effects of average uncertainty and trial-type frequency on choice response time: A hierarchical extension of Hick/Hyman law

• J. Toby Mordkoff
Correction

Correction to: Psychon Bull Rev

In Mordkoff (2017), the intention was to exclude from the analyses all trials that immediately followed an error. This was done as intended for mean response time, the main dependent measure. However, for the errors, instead of excluding trials that followed an error, only these trials were retained. This caused the reported error rates to be very different from (and very much lower than) the actual values. The correct values are provided in the table below (which should be used in place of Table 1 in Mordkoff, 2017). A formal analysis of the appropriate data revealed only one significant finding: a positive correlation across the nine conditions between mean response time and mean error-rate (r = .77, p = .014), indicating no evidence of a speed-accuracy trade-off. Therefore, this correction to the reported error-rates evokes no changes to the conclusions of the paper.
Table 1

Average uncertainty, trial frequency, surprisal, probability, and summaries of performance for each of the block- and trial-level conditions; Mordkoff, 2017

Block-level condition

Trial-level condition

h(i)

p(i)

Errors

Mean RT (all trials)

Mean RT (non-reps)

High H ▲

H = 1.555

(mean p = .347)

Three per 12

2.000

.250

5.4%

518 ms

532 ms

Four per 12

1.585

.333

4.7%

514 ms

534 ms

Five per 12

1.263

.417

3.9%

498 ms

533 ms

Medium H ■

H = 1.459

(mean p = .389)

Two per 12

2.585

.167

5.8%

529 ms

535 ms

Four per 12

1.585

.333

3.8%

512 ms

534 ms

Six per 12

1.000

.500

3.1%

482 ms

523 ms

Low H ▼

H = 1.281

(mean p = .458)

One per 12

3.585

.083

3.7%

521 ms

521 ms

Four per 12

1.585

.333

4.1%

495 ms

513 ms

Seven per 12

0.778

.583

3.0%

454 ms

500 ms

RT response time

## Reference

1. Mordkoff, J.T. (2017). Effects of average uncertainty and trial-type frequency on choice response time: A hierarchical extension of Hick/Hyman Law. Psychonomic Bulletin & Review, 24, 2012-2020