Periodicity pitch perception and its upper frequency limit in cats

We have established a procedure for behavioral assessment of periodicity pitch perception in the cat. This procedure requires the training of cats to make a differential response to two different pure tones, and then testing for the transfer of learning when complex stimuli known to produce periodicity pitch sensations in humans are substituted for the pure tones. Complex stimuli consisted of three to five harmonically related frequencies of the same amplitude and phase. Eight cats were the subjects of these experiments. Two of them were controls. It is demonstrated here that cats do perceive periodicity pitch. We also used this procedure to measure the upper frequency limit of periodicity pitch perception for two cats. The frequencies tested were 100, 200, 300, 400, 600, 800, 900, and 1,200 Hz. The data indicate that the upper frequency limit of periodicity pitch perception in the cat is on the order of 600 to 800 Hz. There is a trend of decreasing prominence of the perception of periodicity pitch as the component frequencies are increased. These results are parallel to the human psychophysical data.     

Auditory contralateral induction: An early stage in binaural processing

Binaural interaction was studied using headphones presenting signals (tones or filtered speech) to one ear and noises of various spectral compositions to the other. Every half-second, the sides receiving the signal and noise were reversed. The noise was always perceived to alternate from side to side, but the signal appeared to be stationary and diffusely localized about the midsaggital plane when the noise contained the spectral components of the signal at appropriate intensity levels. This delateralization of a monaural signal results from a process called “contralateral induction” (CI). Additional observations indicate that CI corresponds to an early stage in binaural interaction which generally escapes notice because of further perceptual processing.     

Distance perception under binocular and monocular viewing conditions

First, third, and fifth graders and college adults made judgments of absolute distance in a binocular (full-information) condition and in one of three monocular conditions: redundant texture gradient, compression gradient, and control (no texture). No age-related differences in accuracy of judgment were observed in any of the conditions. Substantial differences in the effectiveness of different kinds of information were found, however. The results indicate that the ability to register information for distance is well developed by first grade, but that substantial limitations exist on the visual system’s ability to process various forms of redundant information.     

Rules, risk and self-disclosure

The notions of rules and risk are inextricably involved with self-disclosure in counselling and in personal relationships. A hundred single British male under-graduates were asked to rate 120 self-referent items in terms of whether, if that item were true of them, they would like or dislike that aspect of themselves; and then to assess the degree of risk that might be entailed in disclosing it to a close male friend, a close female friend, a male acquaintance, and a female acquaintance. The characteristics most positively valued included happiness, health, heterosexuality, agood' job, and getting on well with others (including parents). In general, subjects anticipated greater risk in disclosing negative than positive characteristics, though there were some exceptions. The degree of friendship with the recipient of the disclosure appeared to lessen the anticipated risk of disclosure, while the sex of the disclosee generally made only a marginal difference. The findings are discussed in terms both of students' self-esteem and also of their relevance to counselling. Additionally, the social exchange implications of positive and negative self-disclosure are considered.     

Fear of failure and fear of success

Verbal leads were used to elicit TAT responses from 160 male and female high school seniors, under neutral and aroused conditions. These protocols were scored for fear of success (FOS) according to the 1973 revised scoring system developed by Horner, Tresemer, Berens, and Watson (Note 1) and also scored for fear of failure (FOF) according to the Hostile Press Scoring System developed by Birney, Burdick, and Teevan (1969). Significant positive correlations between the two motive scores were obtained under both neutral and aroused conditions. The lack of independence between the FOS and FOF scores reflects theoretical similarities in the definitions of the motives, as well as considerable overlap in the scoring systems. It was hypothesized that for those people (especially women) whose affiliative and achievement needs are interrelated, FOF and FOS may be nearly equivalent, since fear of social rejection thus becomes tantamount to fear of failure.     

Attention to pure tones

Listeners were required to detect increments of intensity or frequency in trains of pure tone bursts under different conditions of attention. The data were analysed taking into account contralateral events when more than one stimulus train was present. Marked changes in d' and β were found and the changes were positively correlated.

If targets are rare and attention is divided the values of β and d' are the same as in undivided attention provided that the contralateral event is a correct rejection, but fall if the contralateral events are hits or false alarms. If targets and non-targets are equi-probable no such difference is found. The data suggest that the observers can make use of the statistical properties of the stimulus sources. The results are compared with those in recent experiments using pure tones in a discrete trial paradigm and in experiments using semantic stimuli.     

Hardware and software evolution of an adaptive ability measurement system

A software system for the administration of six different strategies of adaptive ability tests in a variety of formats was developed both on a large-scale time-sharing system and on a real-time minicomputer system. Factors influencing both hardware selection and software design are discussed.     

The use of on-line computers in psychobiology

This paper examines several areas in the use of laboratory computers in psychobiology, specifically how they are being used, the problems in languages and software, in interfacing computers to experimental configurations, and in the hardware involved. The paper defines the experimental tasks and data requirements which tend to distinguish computer usage in physiological research from other areas of psychology and the tasks which absolutely necessitate the use of a computer and in what mode. Finally we present our views of the dangers of computer use and misuse and make our own subjective evaluation of how well computers are living up to their end of the bargain, how well scientists are doing at their end, and where we should go from here.     

Digital computer estimation of eye fixations

A method is presented for estimating eye fixations to the degree of accuracy desired. In the process, the quantity of data is greatly reduced so that analysis can be accomplished at the end of each experimental run. The algorithm is particularly suitable for “slow” computers because the analog-to-digital conversion rate can be low and because the data reduction process decreases the number of calculations required to obtain the analytical results.