Neil R. Bartlett

Latency and duration of eye movements in the horizontal plane.

The electrical method of eye movement recording (EOG) was used to study the reactions of the eyes when subjects attempted to fixate as quickly as possible on light stimuli appearing at various points along the horizontal plane. Each eye was recorded separately, allowing an assessment of the degree of independence of the eyes when reacting in this way. In addition to the data concerning latency of ocular reactions and the duration of eye movements, information regarding the relative speed of movements from periphery to center as compared to movements from center to periphery was obtained. It was also found that the two eyes tend to act independently in regard to latency and speed of movement when moving toward peripheral stimuli.

A comparison of manual reaction times as measured by three sensitive indices

Visual reaction time data for each of three subjects are analyzed to show by how much the response as recorded by a sensitive microswitch, closed by forearm movement, lags behind the initial application of pressure, as recorded by a strain-gauge device, and in turn by how much the latter falls behind the muscle action potential. The data afford rough corrections for translating typical reaction time data to those concerned with the initiation of the peripheral effector response.

Effects of checkerboard pattern stimulation on evoked cortical responses in relation to check size and visual field

Cortical evoked responses to checkerboard stimulation were studied as a function of check size and visual field. Stimuli were presented to the upper, central, and lower parts of the retina. Regardless of check size, largest potentials were obtained to lower-field stimulation; central-field stimulation yielded intermediate responses; upper-field stimulation produced the smallest responses. Maximal responses were obtained to intermediate check sizes during lower-field stimulation and to the smallest checks during upper-field stimulation. The results suggest that the cortical visual system is more responsive to patterned stimuli appearing in the lower viewing field than in the upper, but that the system may be relatively more sensitive to smaller objects appearing in the upper field.

Evoked Potentials and Correlated Judgments of Brightness as Functions of Interflash Intervals

Computer-averaged evoked potentials were recorded from subjects presented with pairs of flashes having equal light energy but differing in duration of the brief interval separating the flashes. For the experimental conditions studied, the pair was always subjectively fused. Although the brightness did not change noticeably as the interval was varied, the use of the forced-choice psychophysical technique showed that apparent brightness declined with increase in the interval. Analysis of the evoked potentials revealed a correlated change in amplitude and wave form previously demonstrated for changes in flash flux alone.

Binocular summation in the evoked cortical potential

Computer-averaged evoked potentials were recorded from six subjects presented with flashes under conditions of binocular and monocular viewing, with a device fitted over each eye to produce ganzfeld conditions. Tests were run with red light and with blue. Analysis of the evoked potentials indicates a substantially larger amplitude with binocular stimulation.

SYNCHRONIZATION ERROR IN ATTEMPTS TO MOVE THE HANDS SIMULTANEOUSLY

Means and standard deviations are reported for the synchronization error in the initial motion of attempts to move the two hands simultaneously. For alert, trained Ss (N = 12) the error appears to be independent of whether the movement is made on signal or at Ss option.

Latency of the blink reflex and stimulus intensity J

The latency of the eyeblink reflex is inversely related to the intensity of the auditory or visual stimuli used to evoke it. This is true for both mechanical and muscle action potential methods for recording the response.

Cortical potentials evoked by the onset and the termination of foveal stimulation

Responses to the termination of brief dim flashes confined to the human fovea are shown to be more pronounced than to the initiation of the flashes. This was true for both red light and for blue.

A device for research in human information processing capacity.

Biosensory unilateral response processor /burp/ - human information processing capacity determiner

The Psychological Record: Rebirth in 1956

The Psychological Recordwas revived forty years ago by Paul Swartz, still in his twenties and an assistant professor in a small liberal arts college. This article describes the setting in which it occurred and some of the story of his undertaking.