AFB JOURNAL OF VISUAL IMPAIRMENT
Copyright © 2009 American Foundation for the Blind. All rights reserved.


Table 1

Detection times when listening in quiet. Click here for description

Listening conditions
Total trials
Range of detection time (in seconds)
Average (SD in parenthesis) detection time (in seconds)
Average (SD in parenthesis) safety margin (in seconds)
Median safety margin (in seconds)
Straight
144
7-35
13.79 (4.67)
6.79 (4.67)
6.00
Baffle
50
5-32
13.34 (5.73)
6.34 (5.73)
5.00
Severe bend
60
4-19
7.62 (3.11)
0.62 (3.11)
0.00
Minor bend
39
4-28
11.08 (4.93)
4.08 (4.93)
3.00
Hill
43
4-20
9.51 (3.56)
2.51 (3.56)
3.00
Treed approach
24
7-26
11.25 (4.40)
4.25 (4.40)
3.50

Description:
There are 6 main column heads:
Listening conditions; Total trials Range of detection times (in seconds) Average (SDs in parentheses) detection time (in seconds) Average (SDs in parentheses) safety margin (in seconds) Median safety margin (in seconds)

Straight 144 7-35 13.79 (4.67) 6.79 (4.67) 6.00

Baffle 50 5-32 13.34 (5.73) 6.34 (5.73) 5.00

Severe bend 60 4-19 7.62 (3.11) 0.62 (3.11) 0.00

Minor bend 39 4-28 11.08 (4.93) 4.08 (4.93) 3.00

Hill 43 4-20 9.51 (3.56) 2.51 (3.56) 3.00

Treed approach 24 7-26 11.25 (4.40) 4.25 (4.40) 3.50

Table in Paragraph format.

Description: There are 6 main column heads: Listening conditions; Total trials; Range of detection times (in seconds); Average (SDs in parentheses) detection time (in seconds); Average (SDs in parentheses) safety margin (in seconds); Median safety margin (in seconds)

Listening conditions: Straight; Total trials: 144; Range of detection times (in seconds): 7 to 35; Average (SDs in parentheses) detection time (in seconds): 13.79 (4.67); Average (SDs in parentheses) safety margin (in seconds): 6.79 (4.67); Median safety margin (in seconds): 6.00

Listening conditions: Baffle; Total trials: 50; Range of detection times (in seconds): 5 to 32; Average (SDs in parentheses) detection time (in seconds): 13.34 (5.73); Average (SDs in parentheses) safety margin (in seconds): 6.34 (5.73); Median safety margin (in seconds): 5.00

Listening conditions: Severe bend; Total trials: 60; Range of detection times (in seconds): 4 to 19; Average (SDs in parentheses) detection time (in seconds): 7.62 (3.11); Average (SDs in parentheses) safety margin (in seconds): 0.62 (3.11); Median safety margin (in seconds): 0.00

Listening conditions: Minor bend; Total trials: 39; Range of detection times (in seconds): 4 to 28; Average (SDs in parentheses) detection time (in seconds): 11.08 (4.93); Average (SDs in parentheses) safety margin (in seconds): 4.08 (4.93); Median safety margin (in seconds): 3.00

Listening conditions: Hill; Total trials: 43; Range of detection times (in seconds): 4 to 20; Average (SDs in parentheses) detection time (in seconds): 9.51 (3.56); Average (SDs in parentheses) safety margin (in seconds): 2.51 (3.56); Median safety margin (in seconds): 3.00

Listening conditions: Treed approach; Total trials: 24; Range of detection times (in seconds): 7 to 26; Average (SDs in parentheses) detection time (in seconds): 11.25 (4.40); Average (SDs in parentheses) safety margin (in seconds): 4.25 (4.40); Median safety margin (in seconds): 3.50

JVIB, Copyright 2009 American Foundation for the Blind. All rights reserved.

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