PMID- 10370338
OWN - NLM
STAT- MEDLINE
DCOM- 19990719
LR  - 20190822
IS  - 0031-5117 (Print)
IS  - 0031-5117 (Linking)
VI  - 61
IP  - 4
DP  - 1999 May
TI  - Ultra-precise quantal timing: evidence from simultaneity thresholds in long-range 
      apparent movement.
PG  - 707-26
AB  - Conditions for the disappearance of long-range apparent movement were 
      investigated. In an experiment on beta motion, critical interstimulus intervals 
      (ISIs) of downward simultaneity thresholds for stimuli presented in continuous 
      alternation were determined for exposure durations (EDs) varying from 3 to 160 
      msec. Each subject performed each test twice. Data were collected in three 
      sessions, each for one of three angular separations (3 degrees, 6 degrees, and 12 
      degrees) and the full set of EDs. The distribution of critical ISIs collapsed 
      across subjects, EDs, and angular separations shows sharp maxima at regular 
      distances within a range of 0-110 msec ISI. Significant or near-significant peaks 
      were found at ISIs of 5, 9, 22, 27, 43, 55, and 107 msec. Although mean critical 
      ISIs shifted with spatial separation, no essential shift of the main maxima 
      occurred. Evidence of a periodic modulation with a period duration of 4.5 msec 
      was obtained from the distributions of differences between critical ISIs of the 
      first tests and their replications, which exhibit extremely low standard 
      deviations (< 10 msec). These results agree well with previous analyses 
      (Geissler, 1987, 1992) that led to a taxonomic model of quantal timing, briefly 
      summarized in this paper. Further consequences are discussed and related to 
      earlier developments (Geissler, 1991, 1992, 1997).
FAU - Geissler, H G
AU  - Geissler HG
AD  - Institut fur Allgemeine Psychologie Universitat Leipzig, Germany. 
      geissler@rz.uni-leipzig.de
FAU - Schebera, F U
AU  - Schebera FU
FAU - Kompass, R
AU  - Kompass R
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Percept Psychophys
JT  - Perception & psychophysics
JID - 0200445
SB  - IM
MH  - Adult
MH  - Analysis of Variance
MH  - Chi-Square Distribution
MH  - Female
MH  - Humans
MH  - Male
MH  - Models, Neurological
MH  - Models, Psychological
MH  - Motion Perception/*physiology
MH  - *Periodicity
MH  - Signal Detection, Psychological/*physiology
MH  - Time Perception/*physiology
EDAT- 1999/06/17 00:00
MHDA- 1999/06/17 00:01
CRDT- 1999/06/17 00:00
PHST- 1999/06/17 00:00 [pubmed]
PHST- 1999/06/17 00:01 [medline]
PHST- 1999/06/17 00:00 [entrez]
AID - 10.3758/bf03205540 [doi]
PST - ppublish
SO  - Percept Psychophys. 1999 May;61(4):707-26. doi: 10.3758/bf03205540.