Importance of head axes in perception of cutaneous patterns drawn on vertical body surfaces

Sekiyama, Kaoru

doi:10.3758/bf03212182

Cited by 23 publications

(34 citation statements)

References 15 publications

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“…In these earlier studies, letters or numbers were drawn on the subject's palm (Corcoran, 1977) or single letters or numbers were presented to the fingers or palm (Oldfield & Phillips, 1983;Parsons & Shimojo, 1987;Sekiyama, 1991). The orientation of the stimulated skin site was varied.…”

Section: Discussionmentioning

confidence: 99%

“…In broad terms, the perception of tactile patterns reflects both bottom-up and top-down processing. A number of ingenious studies have extended this initial observation and demonstrated how altering the position of the stimulated body part in space, the hand, for example, alters the perception of the pattern (Corcoran, 1977;Oldfield & Phillips, 1983;Parsons & Shimojo, 1987;Sekiyama, 1991).…”

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confidence: 99%

“…In studies by Oldfield and Phillips (1983), Parsons and Shimojo (1987), and Sekiyama (1991), subjects were presented with normal and mirror-reversed letters and numbers at various body sites, including the hand, and were asked to respond whether they perceived each stimulus as being normal or mirror reversed. As the orientation of the hand was varied, the subjects' perceptions of whether the stimuli were normal or mirror reversed were found to vary.…”

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confidence: 99%

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The effect of spatial orientation on the perception of moving tactile stimuli

Rinker

Craig

1994

Perception & Psychophysics

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Previous studies have shown that the perception of spatial patterns, such as letters, presented to the hand is affected by the spatial orientation of the hand. The present study investigated how the perception of direction of motion across the fingerpads changes with the position of the hand in space. The moving stimuli were generated on two displays. In one condition, the displays were placed horizontally in front of the subject, with the subject's thumb (target site) and index finger (nontarget site) placed flat on the displays. In a second condition, the displays were vertically oriented and gripped between the thumb and index finger. Using a selective-attention paradigm in which subjects are instructed to respond only to the direction of motion at the target site, performance was still affected by the direction of motion at the nontarget site. Changing the orientation of the displays changed the effectiveness of the nontarget in interfering with the identification of the target movement. Nontarget stimuli that produced no interference in the horizontal orientation did so in the vertical, and vice versa. It appears that subjects are not using the local direction of movement across the fingerpads to judge the relative direction of movement at the two sites; rather, they are using the external direction of movement.

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The effect of spatial orientation on the perception of moving tactile stimuli

Rinker

Craig

1994

Perception & Psychophysics

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“…In view of the fact that the hand has a number of degrees of freedom, the local pattern of sensory information received at a particular site on the hand often has to be interpreted in light of the position of the hand in space. Some studies have shown that the perception of the pattern of local motion on the hand or other skin surfaces depends on the position of the stimulated part in space (Oldfield & Phillips, 1983;Parsons & Shimojo, 1987;Sekiyama, 1991). For example, the letter "b" drawn on the palm facing the observer will generally be perceived as the letter "b," but when the same local pattern is drawn on the palm facing away from the observer, the letter "d" is perceived.…”

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The effect of hand position and pattern motion on temporal order judgments

Craig

2003

Perception & Psychophysics

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“…The other vantage point had an external locus, like a disembodied rye (Concoran, 1977), and was often the vantage point of the experimenter. Although it is not known why a particular vantage point is used in a particular instance and the selection may be readily malleable by instructions, the use of'various vantage points in touch is likely a "process shared by blind and sighted individuals" (Shimojo, Sasaki, Parsons, & Torii, 1989, p. 149) and is not solely visual or, it seems, due to any kind of visual imagery that requires sight (see also Kennedy, 1993Kennedy, , 1997Sekiyama, 1991).…”

Section: \ Ismentioning

confidence: 99%

Which way is upright and normal? Haptic perception of letters above head level

Mirabella

Kennedy

1999

Perception & Psychophysics

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In three experiments, the perception of the apparent orientation of block letters shown in various orientations above the subject's head in the horizontal plane was examined. A block letter F with its front facing down toward the observer has two crossbars on its right side; the top is the part with the long crossbar, and the base has no bar. The experiments involved changing the locations of these parts with respect to the observer. In Experiment 1,the subjects using touch most often identified a letter as having its left and right sides in a normal orientation if the front of the block letter faced upwards away from the observer, with the bar on the right and the top of the letter farther from the subject than the letter's base. In Experiment 2, the subjects judging visual uprightness favored positions in which the bars were on the right, the top of the block letter was near them, and the letter's front faced downwards toward the observer. In Experiment 3, the subjects using touch most often assessed letters as being upright if the top of the letter was the farthest part and the bar was on the right. The results suggest that, when assessing orientation, subjects using touch favored positions that would be reached by a letter moving vertically upwards from table height, but subjects relying on vision favored positions reached by a letter moving in an arc centered on the subject's head (on the eyes, in particular).

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Importance of head axes in perception of cutaneous patterns drawn on vertical body surfaces

Cited by 23 publications

References 15 publications

The effect of spatial orientation on the perception of moving tactile stimuli

The effect of spatial orientation on the perception of moving tactile stimuli

The effect of hand position and pattern motion on temporal order judgments

Which way is upright and normal? Haptic perception of letters above head level

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