PMID- 23961837
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20130822
LR  - 20130821
IS  - 0022-2895 (Print)
IS  - 0022-2895 (Linking)
VI  - 6
IP  - 4
DP  - 1974 Dec
TI  - Effects of number of alternatives on the psychological refractoriness of an 
      extended movement .
PG  - 227-34
LID - 10.1080/00222895.1974.10734999 [doi]
AB  - The single-channel prediction that delays in RT2 should be proportional to RT1 
      was examined by varying the number of alternatives (one, two, or three) in the 
      primary response which was an extended arm swing at maximal speed. The second 
      response was a thumb key release. Foreperiods were 2, 3, or 4 sec., and 
      interstimulus intervals (ISIs) ranged from .10:50 sec. in .10-sec. steps. General 
      support for the single-channel model was found in that RT2 paralleled changes in 
      RT1. However, RT2 was greater than predicted when the second signal (S2) occurred 
      during the execution of the primary response. In addition, while delays in RT2 as 
      a function of ISI - RT1 showed corresponding differences between choice 
      conditions, most values were greater than predicted. The deviations from the 
      single-channel model appeared to be explained best in terms of a decrease in 
      readiness to respond to the second signal as ISI lengthened.
FAU - Williams, L R
AU  - Williams LR
AD  - a School of Physical Education , University of Otago, New Zealand.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Mot Behav
JT  - Journal of motor behavior
JID - 0236512
EDAT- 1974/12/01 00:00
MHDA- 1974/12/01 00:01
CRDT- 2013/08/22 06:00
PHST- 2013/08/22 06:00 [entrez]
PHST- 1974/12/01 00:00 [pubmed]
PHST- 1974/12/01 00:01 [medline]
AID - 10.1080/00222895.1974.10734999 [doi]
PST - ppublish
SO  - J Mot Behav. 1974 Dec;6(4):227-34. doi: 10.1080/00222895.1974.10734999.