The perception of temporal order is investigated. Suitable localization of the signals is also used to study the functional asymmetry of the cerebral hemispheres during perception of temporal order. The experimental data obtained correlate well with earlier assumptions of ours, namely: (a) separate mechanism for perception of temporal order; (b) ...

For two trained rhesus monkeys, increment thresholds for a small test-spot of 100 ms duration were determined as a function of background size, at 10 retinal eccentricities along the horizontal meridian. Typical 'Westheimer-functions' were obtained, i.e. threshold first increases with increasing background size, reaches a maximum, then decreases with further ...

Subjective borders are known to behave quite similarly to real borders when the stimulus presents fragments of visually meaningful forms. There is less information on whether this also applies to unfamiliar stimulus elements. Thus, if a dark/bright stimulus border is presented intermittently at certain frequencies below flicker fusion, the bright ...

The analysis of motion perception historically has included efferent as well as afferent mechanisms to account for the perception of motion during eye movement. The application of efferent mechanisms to motion perception has been limited, however, by several illusions which are apparently inconsistent with the notion that oculomotor mechanisms contribute ...

When a vernier target is flanked by optimally positioned lines, foveal vernier discrimination is strongly degraded (Westheimer and Hauske, 1975). We confirmed this observation (Experiment I) and have mapped out a 2 dimensional "perceptive field" for crowding in the fovea using a 2 dot target (Experiment II). Crowding was also ...

Contrary to the view that ambient light information unequivocally specifies phenomenal events, recent research suggests that natural event perception is determined by processes that pick up and combine visual and motor information. This thesis is challenged by Turvey and Solomon (1984). The present article responds to their misgivings by elaborating ...

The auditory processing of the acoustic patterns of speech relevant for the perception of phonetic units is discussed in terms of a three-stage generic model of phonetic perception. It is argued that the auditory system analyzes each brief segment of the acoustic waveform of speech for tonal components and the ...

The perception of duration, visually presented, has been studied depending on the visual half-field in which the light stimulations have been presented. The pair of intervals of equal duration, presented for comparison in the 200-1000 ms range, was studied in three different series, in each of which the beginning of ...

Two studies investigated the influence of the independently varied durations of preceding and following signal portions on the amount of closure silence needed to perceive 'splash' rather than 'slash'. Increases (or decreases) in the durations of the [s] and [l] acoustic segments had opposite effects which cancelled when the silent ...

Recent findings about our perception of Glass patterns suggest that the processes responsible for the perception of a global pattern composed of random features may be mechanisms performing measurements in the spatial and energy domain rather than logical operations on symbolic descriptions. These mechanisms may be based on principles derivable ...

An initial experiment revealed that, under very rapid viewing conditions, the usual asymmetry for face recognition occurred only for low-detail facial sketches. Photographs and medium-detail sketches failed to show VF asymmetry. A further experiment revealed that the effect was unlikely to be attributable to discrimination difficulties; this experiment, however, replicated ...

It has been proposed that the human visual system prefers perceptions of objects that are rigid or undergo minimum form change. A counterexample is presented in which a rigid two-dimensional figure rotating in the frontal plane is perceived as a distorting three-dimensional shape. It is argued that this perception results ...

The perception of visually presented duration is studied depending on the visual half-field in which the light stimulation has been presented. Light stimuli of the order of 200-1000 ms, of equal duration, divided by a 10 ms interval, were presented in random order, one in the left, the other in ...

Because the perception of waveforms has been relatively neglected in vision research, one phenomenon of waveform perception, the parsing of waves into peak-shaped rather than trough-shaped segments, is examined. It is suggested that this so-called 'peak preference' is a grouping rule which can determine figure-background segregation in some circumstances. It ...

It has been suggested that perceived size depends upon the distribution of responses among a localized population of different size-tuned mechanisms. If so, then manipulations which alter this distribution should also affect perceived size. We therefore studied the effects of luminance contrast and mode of temporal presentation on size perception. ...

A comparison was made between listeners' perceptions of low frequency (LF) acoustic and electric stimuli. One normal-hearing S participated, and 3 profoundly deaf pts with intracochlear electrode systems. All Ss described their auditory perceptions to pulsatile and sinusoidal stimuli from 5 to 60 c/s. LF acoustic and electric stimuli produced ...

To explore the role of cross-modal perception in the apprehension of synesthetic metaphors, subjects read 15 short lines from poetry, each of which contained a metaphor relating visual and auditory qualities; the subjects' task was to set the loudness of a 1000-Hz tone and the brightness of a white light ...

A taxonomy of psychological defence mechanisms based on general systems concepts is proposed. The personality system consists of the subsystems concerned with input, internal processing, and output of information. Psychological defence mechanisms can be classified according to the subsystem whose function is mainly altered. Defence mechanisms primarily altering the input ...

In binocular fusion, pairs of left and right stimuli yielding the same brightness perception constitute an equibrightness curve in a coordinate system whose ordinate and abscissa correspond to left and right stimulus strengths. A neural network model is presented to elucidate the characteristics of the curve. According to the model, ...

Increment thresholds were measured at the intersections of a modified Hermann Grid at several retinal locations and at photopic, mesopic and scotopic adaptation levels. On a concentric perceptive field explanation of the illusion, these results suggest that a broad distribution of perceptive field sizes exists at each visual field location. ...

Distances were presented to the right and left halves of the visual field during steady fixation of a central point. Two methods of evaluation were used: direct scaling and the method of limits. A small but statistically significant difference was found between the estimates of distances presented to the left ...

It is proposed that motion perception is mediated within two parallel channels in the visual system. These channels are distinguished by the following properties: rate of recovery from adaptation; degree of fine tuning for contour orientation; inclusion of color sensitive units; and ocular dominance characteristics. Three experiments are reported which ...

It has been assumed that certain stimulus transformations lead directly to depth effects, that is, that such transformations are the necessary and sufficient conditions for kinetically generated depth perception. An alternative is to view such perception as the preferred solution to the problem posed by the transforming stimulus as to ...

A patient with bilateral ocular injuries with hypotony and light perception vision was fitted with scleral shells modified to allow light to pass through the central 4-mm area. This modification, allowing the patient to retain light perception with the prosthesis in place, aided in the rehabilitation of this patient by ...

The effects of reducing the range of spatial perception on the accuracy of visually guided locomotion were studied in two experiments. Limiting the range of perception to only near objects produces changes in the flow of stimulus detail and reduces opportunities for the appearance of an aiming point and for ...

In a series of experiments we have investigated the perception of Moiré patterns as a function of spatial density, rotation and temporal display parameters. Results indicate that the local correlation extraction processes involved in the perception of these patterns is not feature specific, yet is driven by excitatory (correlated) and ...

Previous explanations of the Ames oscillatory effect are evaluated by means of a functional-evolutionary theory of perception. Use of stored interpretations, static elements, and other explanatory ideas are rejected in favor of adaptive response to ambiguity as the essential factor for the effect. It is emphasized that Ss report perception ...

Terhardt [J. Acoust. Soc. Am. 55, 1061-1069 (1974)] postulated a pitch perception model wherein a learning stage constitutes an integral part: it is only repeated exposure to patterns of spectral pitch that will generate the percept of virtual pitch (i.e., the residue). Two examples, one clinical and one musical, are ...

Visual assessments of white samples are evaluated. The range of individual hue preferences is mapped out, but no explanation can be presented. The individual differences in perceiving the contribution of luminance to whiteness are also investigated. Most subjects agree in assessing the whiteness of neutral bluish white samples. High correlation ...

The method of mathematical forecasting of the changes in efficiency throughout an increase in emotional stress is suggested on the basis of experimental data from experiments in which paratroopers discerned visual patterns. The comparison of human errors with the experimental results obtained in animals permitted formulation of several suppositions on ...

Tactile perception of alteration in sentence meaning due to modification of intonation and stress patterns was determined for 10 normal hearing young adults. Stimuli consisted of sentences varying with respect to syllable length (4--7 syllables), place of stress (initial, medial or final), or intonation type (rising, steady or falling). All ...

The literature on visual size constancy implicitly assumes that the perceived size of any dimension of a thing is evidence of how well (a) any other dimension of the thing will be perceived and (b) any visible dimension of any other thing will be perceived under comparable conditions of perception. ...

The object of the study was to observe the changes in efficiency of perceptive activity of man (recognition of visual patterns against a background of noises) throughout an increase in emotional stress caused by a forthcoming parachuete jump. A moderate degree of emotional stress can improve performance efficiency and decrease ...

The relationships between stimulus parameters and perceptions in a prosthetic feedback system were measured using psychophysical methods. Electrical stimulation of the median nerve produced a monotonic relation between frequency of stimulation and the perceived magnitude of the stimulus. There were two qualitatively different perceptions of the stimulation; one for low ...

The perceived shade of gray depends primarily on the luminance relationship between surfaces percieved to lie in the same plane and not between surfaces that are merely adjacent in the retinal image. This result implies that depth perception must precede lightness perception and that lateral inhibition cannot explain lightness constancy.

In the present work, we have shown the effect of a vestibular stimulation on the velocity perception of a moving scene. The intensity of this effect is related to the amplitude of the cart acceleration, image velocity, spatial frequency of the visual stimulus, and the angle between the directions of ...

A method of inducing controlled levels of terminable itching was developed. This method consists of administering constant monophasic pulsations of electric current by means of noninvasive electrodes. Once experimental pruritus had been reliably reproduced, two variables, hypothesized to be relevant to the perception of itching, were investigated, viz, the presence ...

This paper has concentrated on reporting changes along eight dimensions of the Leary ICL in perception of self and of spouse between sober, as if intoxicated, and intoxicated conditions for couples with an alcoholic member. Major findings were that of a pilot sample of four couples, three couples showed significant ...

A psychophysical study of the perception of "sound" induced by illumination with pulse-modulated, ultrahigh-frequency electromagnetic energy indicated that perception was primarily dependent upon peak power and secondarily dependent upon pulse width. The average power did not significantly affect perception. Perceived characteristics of pitch and timbre appeared to be functions of ...

This paper deals with the analysis of visual perceptions of complex patterns consisting of two simple patterns placed one above the other in one frame (united pattern) or in two separate frames each (divided pattern). The upper pattern consisted of a configuration of lines, the lower one of a configuration ...

A field study of the effects of changes in office environment, from a conventional rectilinear bull pen and cubicle style to a modern office landscaped, was conducted. The attitudes and perception of 120 employees were recorded using a semantic scaling instrument, and an attempt was made to apply this data ...

Several classes of interneurons in the optic lobes and brain of the insects, Musca domestica and Calliphora phaenicia, have been studied in detail. Visual stimuli have been categorized on the basis of the properties of intensity, form, and motion. Response characteristics of the classes of neural units are described with ...

The torque produced by the neck muscles of a locust mounted coaxially in an illuminated cylindrical striped drum follows small sinusoidal oscillations of the drum. Peak-to-peak oscillations of 0.03 degree (+/- 0.02 degree) at 0.1 cy/sec elicit measurable responses. Several features of this visual response to drum oscillation can be ...

Ultrasonic vibrations can be perceived as audible sounds when a piezoelectric transducer is pressed against certain areas of the human body. In the range of frequencies investigated (20 to 108 kcy/sec), the threshold of perception seemed to lie near the threshold of feeling (about 10(-4) watt/cm(2)), and the perceived audible ...