. Author manuscript; available in PMC: 2009 Mar 30.

Published in final edited form as: Clin Interv Aging. 2008;3(4):749–760. doi: 10.2147/cia.s4194

Table 2.

Time estimation of four human adults in the absence of known time cues

EH (M)

MS (M)

TS (M)

JL (F)

Procedure
(interval)

Index evaluated

N of obs
(N of days)

R
(± SD)

N of obs
(N of days)

R
(± SD)

N of obs
(N of days)

R
(± SD)

N of obs
(N of days)

R
(± SD)

Isolation

“Intuitive”
(empty)

R * = \frac{S months}{E months}

2
(59)

0.58

2
(121)

0.54

2
(87)

0.84

R = \frac{S hours}{E hours}

108
(11)

1.01
(± 0.17)

231
(59)

0.56
(± 0.28)

536
(125)

0.66
(± 0.31)

294
(88)

0.45
(± 0.25)

Yes

Rational (filled,
ie, counting
from 1 to 120)

168
(59)

0.67
(± 0.12)

310
(125)

0.92
(± 0.09)

175
(88)

0.62
(± 0.12)

161
(31)

0.96
(± 0.08)

196
(31)

0.88
(± 0.09)

Notes: $* R = \frac{S (Subject) time}{E (Environment) time}$ ; these ratios are in italics; they represent means, except for those in first row of table; Means and standard deviations in table refer to data previously “clipped” to mean ± 3 SD; iterative clippings until 4 decimal places remain the same.

Abbreviations: S = subjective; E = environmental.