Affordances and infant learning: A reply to Horowitz

We reply to three major points made by F. Horowitz (1983, Developmental Review, 3, 405–409) in her commentary on the ecological approach to infant knowing presented by E. Goldfield (1983, Developmental Review, 3, 371–404). We first clarify the relation between perceiving and acting from an ecological perspective, and distinguish between affordances as environmental properties scaled to the perceiver/performer and representations as mental structures. We then present a critique of the process of association offered by Horowitz as an explanation of infant learning. Association fails to specify the constraints on what is learned, while the ecological process of noticing affordances, presented by Goldfield, considers such constraints. We conclude by presenting operational criteria for measuring affordances and evidence that perception is scaled to the perceiver/performer.     

Stimulus-reinforcer and response-reinforcer relations in the control of conditioned appetitive headpoking (“goal tracking”) in rats

Experiment 1 studied the effect of several Pavlovian appetitive conditioning procedures on rats' headpoking into a food tray (goal tracking). The procedures included forward delay conditioning, CS-alone extinction, differential conditioning, and simultaneous compound conditioned inhibition training. In general, the headpoke behaved in all of these treatments much like a Pavlovian CR; however, one could also say that the headpoke behaved like an adventitiously reinforced operant for which the CS was an S^D. Experiment 2, therefore, used the differential-nondifferential technique (E. Gamzu & D. R. Williams, Science, 1971, 171, 923–925), and Experiment 3 used an omission technique (F. D. Sheffield, in W. F. Prokasy, Ed., Classical conditioning, New York: Appleton-Century-Crofts, 1965; D. R. Williams & H. Williams, Journal of the Experimental Analysis of Behavior, 1969, 12, 511–520), to try to separate the role of stimulus-reinforcer and response-reinforcer relations in controlling the headpoke. These techniques proved inadequate. The results of Experiment 2 could be given either operant or Pavlovian interpretations. Those of Experiment 3 showed that headpoking is dominated by response-reinforcer, rather than by stimulus-reinforcer, relations when the two compete but forced no conclusion about which dominates when the two act together as in acquisition. Implications for pigeon autoshaping are discussed.     

A psychological perspective interpretation of the attitude-behavior relationship

In two experiments subjects were shown seven items that described uses for photographs taken of them with an opposite-sex black. The uses formed a graded series ranging from a situation in which only other researchers would see the photos to one in which they would be employed in a nationwide campaign for integration. Subjects were either asked to sign releases so that the photographs could actually be taken and used in the ways specified (behavior) or to indicate their hypothetical agreement or disagreement with each release as part of a survey on attitudes (attitude). In both experiments, the attitude subjects agreed to more of the releases than did the behavior subjects. This difference has been termed an attitude-behavior discrepancy by some researchers. However, in both experiments, behavior subjects judged themselves as no less prejudiced than attitude subjects and scaled agreement with each photographic release as reflecting less prejudice than did attitude subjects. These data are consistent with the interpretation that subjects changed their psychological perspectives (Ostrom & Upshaw, 1968) in order to interpret their own behaviors as attitudinally consistent.     

Logical competence and transitive inference in young children

Five-year-old children were trained on the length relationships between the adjacent members of a five-term series of sticks. They were then tested on their abilities (1) to judge the length relationships between nonadjacent pairs of the series, and (2) to incorporate an unseen novel stick into the series through inference. Children who were trained with sticks of markedly different lengths succeeded on the first test but not the second; they apparently relied on memory for the absolute lengths of the sticks. Children in the other groups succeeded on both tests. The critical factor in inducing the use of seriation and transitivity seemed to be the elimination of alternative solutions.     

Effects of eye contact and social status on the perception of a job applicant in an employment interviewing situation

The present study examines the independent and joint effects of variations in eye contact and social status on the way in which job applicants tend to be perceived in employment interviewing situations. The key dependent variable in the analysis is the interviewer's perception of how well the applicant is suited for a job requiring or involving self-confidence. The results, based on a laboratory analogue of an employment interview, show statistically significant main effects for eye contact and social status, as well as a significant two-way interaction effect. Effects of the manipulations on job-specific ratings are also reported, and implications of the research for biases in employment interviewing are discussed.     

Modeling spatial knowledge

A person's cognitive map, or knowledge of large-scale space, is built up from observations gathered as he travels through the environment. It acts as a problem solver to find routes and relative positions, as well as describing the current location. The TOUR model captures the multiple representations that make up the cognitive map, the problem-solving strategies it uses, and the mechanisms for assimilating new information. The representations have rich collections of states of partial knowledge, which support many of the performance characteristics of common-sense knowledge.     

Aphasia type and aging

We analyzed the relationship between age and clinical type of aphasia in 167 right-handed men who had suffered cerebrovascular accidents. Patients with unequivocal diagnoses as Broca's, Wernicke's, anomic, conduction, and global aphasics were considered. The median age of the Broca's group (51 years old) was significantly lower than that of the total group (55.8 years old), while the median age of the Wernicke's group was significantly higher (63 years old). Moreover the incidence of Wernicke's aphasia increased steadily with age, while incidence of the other types of aphasia peaked in the sixth decade and then diminished with increasing age.     

The influence of attention upon anticipatory arousal,habituation, and reactivity to a noxious stimulus

Forty subjects were assigned to four groups, an External-attending Group, an Internal-attending Group, a Control Group, and a Distracted Group. All groups were presented with six trials of a 0.5-sec 110-db white noise. A measure of heart rate deceleration verified the experimental manipulation of attention. During the anticipatory period, the Internal-attending Group exhibited the greatest and the Distracted Group exhibited the least reactivity among the four groups. The two specially attending groups exhibited greater galvanic skin-response conditioning during the anticipatory period than the other groups. There was no support for the hypothesis that heightened attention facilitates habituation. Two measures were differentially sensitive to direction of attention during the anticipatory period. The External-attending Group exhibited reliably greater anticipatory deceleration of heart rate than the Internal-attending Group, while the Internal-attending Group exhibited reliably more nonspecific electrodermal responses than the External-attending Group. This latter finding, along with other evidence, suggests that an inward direction of attention tends to exacerbate anticipatory anxiety as well as reactivity to the impact of a noxious stimulus.     

Long-term memory and retrieval at ages 2, 3, 4

Two experiments are reported examining the contents and accessibility of a subset of the knowledge represented in long-term memory by very young children. In Experiment 1, children aged 2 to 4 were asked in a production task to name items commonly found in particular rooms in a house, and then to verify the appropriate locations of a set of miniature replicas of household items in a dollhouse. In Experiment 2, object context was manipulated to observe if further external context improves or changes production. Children 3 and 4 years old were asked to produce appropriate room items under one of three conditons: either presented no room objects as in the first experiment, or given room objects highly- or less-frequently associated in the first study.Very young children revealed considerable knowledge in this domain, and even at the youngest ages, core defining information was retrieved. It was equally clear, however, that young children know much more than they can produce, that there is noticeable improvement in ability to retrieve information over this age range, and that additional external object context does not necessarily facilitate retrieval from long-term memory.     

Differential acquisition of conditioned suppression in rats with increased and decreased luminance levels as CS + s

Using a conditioned suppression procedure, it was demonstrated that suppression of responding was substantially enhanced when the CS signaling the occurrence of shock was an increment in luminance level (bright CS), relative to an equivalent decrement in luminance level serving as a signal for shock (dim CS). The results of a pseudoconditioning control procedure illustrated that the differential effectiveness of the bright and dim CSs was dependent upon explicit CS-US pairings. The bright and dim stimuli were found to produce equivalent rates of conditioning when they were used to signal the availability of reinforcing stimuli in an appetitive discrimination procedure. The interpretation considered to be most consistent with the data is associative in nature; rats may be brought into the experimental setting prepared to associate bright light with danger and contraprepared to associate dim light with danger.