This review article introduces various approaches to enhance human movement using haptic sensory information
in daily life. Providing additional haptic sensory information through a light (< 1 N) finger touch to a fixed object
resulted in decreased postural sway in various physical positions. This “light touch effect” suggests that haptic
sensory input through touching primarily provides information about body orientation. Researchers recently applied
this effect in various models of daily life. For instance, lightly touching a cane can improve both static and dynamic
postural control. Even a fluttering cloth wrapped around the waist, extending to the lower leg, is effective in improving
postural control. Furthermore, because balance control during human locomotion is also enhanced by wearing a
fluttering cloth, human movement might be enhanced according to the shape of the garment. These studies suggest
that light touch can positively enhance human movement through personal objects used in daily life.
In this study, we compared the effects of sensory modalities and those of transcranial direct-current stimulation
(tDCS) on reproduced durations, and also examined the usefulness of a temporal reproduction task in time perception
performance measurements. Although our experiment demonstrated that reproduced durations were significantly
lengthened when the standard stimulus was presented in an auditory modality, no significant differences were observed
among the tDCS conditions. These results indicate that the temporal reproduction task can detect only large changes
in reproduced durations, and it is therefore necessary to consider another evaluation index to focus on small changes in
time perception performance.
Age-related decrease of crystalline lens transmittance is thought to be a factor affecting non-image forming (NIF)
responses such as melatonin suppression and pupillary light reflex (PLR). In this study, we estimated pupillary spectral
sensitivities of children and young adults and we compared them. Fourteen healthy primary school children and
thirty healthy university students participated in the present study. The estimated spectral response curves tended
to differ between the child group and the adult group (F-test, p ＆lt; 0.1), and their peak sensitivities were 474.2 nm and
479.7 nm, respectively. Our findings indicate that spectral sensitivity of PLR to light depends on age, supporting the
possibility that age-related change in lens transmittance is associated with NIF responses.