Modality-specific information processing and intellectual ability

Two groups of children, one of below average intelligence and one of above average intelligence, were adminitered nine tasks involving matching information between auditory and visual modalities and temporal and spatial presentations. The below average intelligence children made more matching errors than the above average intelligence group, with no indication that matching problems were particular to one modality or particular to cross-modal as opposed to intramodal matching. Factor analyses did suggest, however, that matching processes varied according to levels of intelligence. The results are discussed in terms of the differences between modality-specific and nonmodal theoretical views of sensory systems, and it is noted that neither view alone is adequate to account for the variations found for the two intelligence groups. It is suggested that the results are consistent with Luria's research on neurological organization.     

A research scale for the assessment of psychopathy in criminal populations

This paper describes an early phase in the development of new research scale for the assessment of psychopathy in criminal populations. The scale is meant to be a sort of operational definition of the procedures that go into making global ratings of psychopathy. While the interrater reliability of these ratings is very high ( > 0.85) they are difficult to make, require a considerable amount of experience, and the procedures involved are not easily communicated to other investigators. Following a series of analyses, 22 items were chosen as representative of the type of information used in making global ratings. Two investigators then used interview and case-history data to complete the 22-item checklist for 143 male prison inmates. The correlation between the two sets of total checklist scores was 0.93 and coefficient alpha was 0.88, indicating a very high degree of scale reliability. The correlation between the total checklist scores and global ratings of psychopathy was 0.83. A series of multivariate analyses explored the factorial structure of the scale and demonstrated its ability to discriminate very accurately between inmates with high and low ratings of psychopathy. Preliminary indications are that the checklist will hold up well to crossvalidation.     

Increasing and decreasing intrinsic interest with contingent rewards: A test of cognitive evaluation theory

The study examined Deci's (Deci, E. L. Intrinsic motivation. New York: Plenum Press, 1975) hypotheses regarding the effects of contingent rewards on intrinsic task interest. Seventy-two male university students worked on a series of puzzles and were given either a high value reward ($1.50) or a low value reward ($.45). The money was given either contingent upon the simple execution of the task (task-contingent), contingent upon the ostensible attainment of a performance criterion level (criterion-contingent), or noncontingent and unexpected (control). Compared to the high payment control subjects, subjects who received the task-contingent high reward rated the task as less interesting, while subjects who received the criterion-contingent high reward rated it as more interesting. Also, subjects expressed less interest in the task after receiving the high task-contingent reward than the low task-contingent reward, but indicated greater interest after receiving the high criterion-contingent reward than the low criterion-contingent reward. It was concluded that substantial support was obtained for Deci's (1975) cognitive evaluation theory.     

Impairment of nonlinguistic hand movements in a deaf aphasic

A deaf man who became aphasic for sign language was seen 4 years after a left-hemisphere stroke. While not impaired on traditional apraxia tests, he was impaired, relative to nonaphasic deaf controls, in the imitation of complex nonlinguistic hand movements. He was not impaired on single isolated movements. These findings are interpreted as supporting a concept of left-hemisphere function which emphasizes complex motor control.     

Cross-modal matching and association under sodium amytal

Anatomical and theoretical considerations, as well as experimental findings, have yielded conflicting points of view regarding the abilities of the right hemisphere in man to accomplish cross-modal transfer of information. Auditory—visual cross-modal matching (CMM) and association (CMA) abilities of the left and right hemisphere (LH and RH) were tested, using the Wada intracarotid sodium amytal technique. It was found that the RH performed slightly better on these tasks than the LH. These findings contrast with results of other techniques which indicate that the RH cannot perform CMM and CMA.     

Intratrial proactive interference in pigeon short-term memory: Manipulation of stimulus dimension and dimensional similarity

Proactive interference was studied using an intratrial preparation in two delayed matching-to-sample experiments employing pigeons. On interference trials, an interfering sample and a target sample were presented successively and were followed by a test consisting of a choice between two stimuli, one associated with each sample. Control trials were identical to interference trials except that the interfering sample was not presented. On both types of trials, choice of the comparison corresponding to the target sample was defined as correct. Colored fields and line orientations were employed as sample stimuli in Experiment 1, and samples of food and no food and of number of pecks were employed in Experiment 2. Interference was found to be equally robust regardless of whether the interfering and target samples were each selected from any of the four dimensions (color, line orientation, food/no food, or number of pecks). Amount of interference was found to be independent of whether the interfering and target samples employed on a trial were selected from the same dimension or from different dimensions. Evidence was also obtained suggesting that line orientation comparison stimuli are more likely to elicit a response not based on memory than are color comparison stimuli.     

Control of social desirability in personality inventories: Principal-factor deletion

Rational and statistical techniques for controlling social desirability (SD) in scales derived from self-report inventories are reviewed. The principal-factor deletion technique is explained in detail. It is applied during factor analysis when derived content scales are expected to be tainted with SD. If one principal factor is found to represent social desirability, the implicated factor is dropped and the communalities adjusted before the remaining factors are rotated to a desired simple structure criterion. Subscales derived from resulting factors are free of SD bias. Principal-factor deletion is compared with other approaches including rational techniques, covariate procedures, and target rotation.     

The effects of cue reliability on infants' manual search.

Nine-month-old babies were presented a manual search problem in which toys were hidden in one of two containers, and then the containers were transposed. Over a series of training trials either two, one, or no cues were perfectly correlated with the location of the toy. The infants' first searches became more accurate over training trials in conditions with consistent container and/or position cues. In the final training trial block search performance was best with two cues, intermediate with one cue, and least accurate in the no-cue condition. In a subsequent reversal procedure, in which the toy was placed in the previously unused hiding place, the number of correct first searches also differed according to the nature of cues available across hidings. The implications for learning the concept of object permanence are discussed.     

Conditioned and unconditioned defensive burying in the rat

When rats first encountered a mouse-trap or a flashbulb in a chamber to which they had been habituated, they buried it with bedding material from the floor of the chamber, whereas rats previously habituated to the trap or the flashbulb did not. Conversely, rats did not bury a stationary, wire-wrapped wooden prod or a length of polyethylene tubing, even on first encounter. However, almost every rat struck by the trap, shocked by the prod, exposed to an airblast from the tube, or to a flash of the bulb, buried the respective source of aversive stimulation with the bedding material, even when a comparable control object was present during conditioning and testing. Thus, the phenomenon of defensive burying is not restricted to situations in which neutral objects serve as the source of painful electric shock. Rats seem to enter the experimental environment with an already established tendency to bury some objects (unconditioned defensive burying) but not others, and they readily learn to selectively bury an object that has been the source of any one of a variety of aversive stimuli (conditioned defensive burying).     

The effects of suggestion structure and hypnotic vs task-motivation instructions on response to hallucination suggestions

Hypnotic and task-motivated subjects were given both auditory and visual hallucination suggestions that were either Brief, Long, or provided an imaginary Context. The Long and Context suggestions were equated for length. Task-motivated subjects scored higher than hypnotic subjects on both auditory and visual hallucination suggestions. Suggestion-type (Brief, Long, Context) affected response to the auditory but not the visual suggestion. Hypnotic and task-motivated hallucinators were equally likely to describe their images as being transparent. Theoretical implications are discussed.