INVESTIGADORES
SHALOM Diego Edgar
artículos
Título:
Freedom and rules in human sequential performance: a refractory period in eye-hand coordination
Autor/es:
D. E. SHALÓM; M. SIGMAN
Revista:
JOURNAL OF VISION
Editorial:
ASSOC RESEARCH VISION OPHTHALMOLOGY INC
Referencias:
Lugar: Rockville, MD 20852; Año: 2013 vol. 13 p. 1 - 13
ISSN:
1534-7362
Resumen:
In action sequences, the eyes and hands ought to be
coordinated in precise ways. The mechanisms governing
the architecture of encoding and action of several
effectors remain unknown. Here we study hand and eye
movements in a sequential task in which letters have to
be typed while they move down through the screen. We
observe a strict refractory period of about 200 ms
between the initiation of manual and eye movements.
Subjects do not initiate a saccade just after typing and do
not type just after making the saccade. This refractory
period is observed ubiquitously in every subject and in
each step of the sequential task, even when keystrokes
and saccades correspond to different items of the
sequencefor instance when a subject types a letter
that has been gazed at in a preceding fixation. These
results extend classic findings of dual-task paradigms, of
a bottleneck tightly locked to the response selection
process, to unbounded serial routines. Interestingly,
while the bottleneck is seemingly inevitable, better
performing subjects can adopt a strategy to minimize the
cost of the bottleneck, overlapping the refractory period
with the encoding of the next item in the sequence.