The purpose of this study was to investigate EEG changes in subjects directly after inhalation essential oils, and subsequently, observe any effect on subjective evaluations. sensory evaluation were assessed 13 healthy female four odor conditions. Four conditions (including lavender, chamomile, sandalwood eugenol) applied respectively for each subject the experiment. results as follows. 1) basic factors extracted from 22 adjective pairs by factor analysis evaluation. first "comfortable...

To investigate the behavior of mechanomyogram (MMG) and electromyogram (EMG) signals in time frequency domains during sustained isometric contraction, MMG surface EMG were obtained simultaneously from four muscles: upper trapezius (TP), anterior deltoid (DL), biceps brachii (BB), brachioradialis (BR) 10 healthy male subjects. Experimental conditions consisted 27 combinations 9 postures [3 shoulder angles (SA): 0 degree, 30 degrees, 60 degrees 3 elbow (EA): 120 90 degrees] contraction levels:...

Surface electromyogram (EMG), blood pressure (BP), blink rate (BR) and heart (HR) were recorded before during 4 types of mental task. The task involved 3 tasks that encompassed the memory (M), visual search (VS) color-word (CW) besides control (CT) maintaining a similar posture while focusing on single spot computer screen. Except for CW, any voluntary movement response to stimuli given not demanded. Slightly but significant increases in integrated EMG (iEMG) shown terapezius, biceps...

The purpose of this study was to evaluate muscle fatigue using electromyogram (EMG) and acoustic myogram (AMG) signals the shoulder arm muscles during sustained holding tasks, with elbow at different angles levels maximum voluntary contraction (MVC). EMG AMG four muscles, including upper trapezius (TP), anterior deltoid (DL), biceps brachii (BB), brachioradialis (BR), were recorded experiments 10 healthy young males. conducted under 9 pairs conditions: 3 (120°, 90°, 60°) * %MVC (20%, 40%,...

This article presents our recent studies on the effects of color temperature taste sense and influence bright light exposure during night rest period. Ten male Japanese ten Chinese were exposed to four illumination conditions (200, 1500 lx×3000, 7500 K). Their threshold common tastes amount saliva measured. It was found in both subjects that sensitivities sweet bitter decreased under lower illuminance condition. Under condition, sensitivity decreased. Secretion increased condition Chinese....

The purpose of the present study was to compare physiological responses different types mental stress encountered in workplace. Circulatory and central nervous system were examined 8 healthy males by exposing them 20-min white noise (80 dB(A)) computer-based arithmetic tasks as models vascular cardiac stress, respectively. results indicated that both stresses increased blood pressure showed a cumulative effect exposure period extended. Heart rate prefrontal oxygenated hemoglobin levels...

The purpose of this study was to investigate the influence hedonic properties odors and attention subjects on components olfactory event-related potentials (OERP). were seven healthy male students. Two (orange eugenol) different presented via a constant-flow olfactometer during an oddball paradigm under ignore attend conditions, OERP then established. latencies not affected by qualitatively odors, whereas amplitude late positive component (P3) presentation orange significantly larger than...

The purpose of this study was to investigate the effect exposure bright light on EEG activity and subjective sleepiness at rest mental task during nocturnal sleep deprivation. Eight male subjects lay awake in semi-supine a reclining seat from 21:00 04:30 under (BL; >2500 lux) or dim (DL; <150 conditions. During deprivation, (Stroop color-word conflict test: CWT) performed each 15 min one hour. EEG, sleepiness, rectal mean skin temperatures urinary melatonin concentrations were measured....

Time perception associated with durations from 1 s to several minutes involves activity in the right posterior parietal cortex (rPPC). It is unclear whether altering of rPPC affects an individual’s timing performance. Here, we investigated human performance under application transcranial direct-current stimulation (tDCS) that altered neural activities rPPC. We measured participants’ duration-discrimination threshold by administering a behavioral task during tDCS application. The conditions...

This study examined the effects of color temperature lighting on spontaneous electroencephalographic (EEG) activity and subjective evaluation under physical exercise. Participants (n=10) were asked to (a) sit quietly for 45-min rest, (b) carry out successive exercise bouts 50 W 100 a cycle ergometer 14 mins, (c) 21-min recovery period. EEGs carried during last 6 min adaptation period, immediately after exercise, at 7.5-min 15-min stages period The experiments conducted in laboratory...

The effects of various heel elevations on postural adjustment and lower-extremity muscle activity during the squat-to-stand (SQ-ST) movement were investigated. Eight healthy male subjects participated in experiment, which involved rising from a deep squat with three different elevations: full (FS), plantar aspects feet contact floor (0 degree), slope (SS), 15-degree wedge was applied underneath foot, tiptoe (TS), lifted their heels to preferred height by extending metatarsophalangeal joint....

Seven healthy young male students participated in this study. Each subject sat on a chair an anteroom at 25 degrees C for 30 min and then entered climatic chamber, controlled 40 R.H. 50%, 90 min. Cooling of frontal portion including the region around eyes (FC), occipital (OC), temporal (TC) began after 50 entering. An experiment without head cooling (NC) was also made control measurement. Thermal comfort thermal sensation were improved by cooling, but response same regardless cooled....